## Commit Message

**Restructure documentation layout, update entrypoint links, and migrate folders**

This commit introduces a consistent and modular documentation structure by
grouping related documentation under `libs`, `apis`, and `tutorials`. The
Dockerfile now reflects the new paths, and the index page links have been
adjusted accordingly.

### Folder Migrations
The following documentation directories were moved:

- `./mongo-ops/site` → `./libs/mongo-ops/site`
- `./blog-api/site` → `./apis/blog/site`
- `./tutorials/media-manager/site` (unchanged, retained under tutorials)

These changes improve namespace clarity and reflect the logical separation
between libraries, APIs, and tutorials.

### Additional Changes
- Updated URLs in `_index/index.html` to point to `/libs/mongo-ops/` and `/apis/blog/`.
- Removed outdated root-level documentation folders.
This commit is contained in:
2025-12-10 16:17:29 +05:30
parent 09fe7cb557
commit 03de5cd2b4
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<h1>Basic CRUD</h1>
<h3 id="use-case-1-basic-fastapi-crud-api">Use Case 1: Basic FastAPI CRUD API</h3>
<p><strong>Scenario:</strong> Create a simple user management API with CRUD operations.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">os</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">FastAPI</span><span class="p">,</span> <span class="n">Depends</span><span class="p">,</span> <span class="n">HTTPException</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">contextlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">asynccontextmanager</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">Field</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> <span class="n">MongoConnectionManager</span><span class="p">,</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">BaseDocument</span><span class="p">,</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">BaseRepository</span><span class="p">,</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">ModelRegistry</span><span class="p">,</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="p">)</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="c1"># Model Definition</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="k">class</span><span class="w"> </span><span class="nc">User</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="n">username</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">Field</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">min_length</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">max_length</span><span class="o">=</span><span class="mi">50</span><span class="p">)</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="n">email</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">Field</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="n">is_active</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="c1"># Repository</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="k">class</span><span class="w"> </span><span class="nc">UserRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">User</span><span class="p">]):</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;users&quot;</span><span class="p">,</span> <span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="c1"># Register the model only once</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="n">ModelRegistry</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="s2">&quot;users&quot;</span><span class="p">,</span> <span class="n">User</span><span class="p">,</span> <span class="n">indexes</span><span class="o">=</span><span class="p">[(</span><span class="s2">&quot;email&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)])</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="c1"># FastAPI Lifespan</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="nd">@asynccontextmanager</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">lifespan</span><span class="p">(</span><span class="n">_app</span><span class="p">:</span> <span class="n">FastAPI</span><span class="p">):</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Manage MongoDB connection during the app lifecycle.&quot;&quot;&quot;</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">MongoConnectionManager</span><span class="o">.</span><span class="n">lifespan</span><span class="p">(</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a> <span class="n">uri</span><span class="o">=</span><span class="s2">&quot;mongodb://localhost:27017&quot;</span><span class="p">,</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a> <span class="n">db_name</span><span class="o">=</span><span class="s2">&quot;mydb&quot;</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a> <span class="p">):</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="k">await</span> <span class="n">ModelRegistry</span><span class="o">.</span><span class="n">initialize_all</span><span class="p">()</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a> <span class="k">yield</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="n">app</span> <span class="o">=</span> <span class="n">FastAPI</span><span class="p">(</span><span class="n">lifespan</span><span class="o">=</span><span class="n">lifespan</span><span class="p">)</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="c1"># Dependency Injection</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a><span class="k">def</span><span class="w"> </span><span class="nf">get_user_repository</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">UserRepository</span><span class="p">:</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Dependency-injected repository for users.&quot;&quot;&quot;</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a> <span class="k">return</span> <span class="n">UserRepository</span><span class="p">()</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a><span class="c1"># Routes</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/users/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_user</span><span class="p">(</span><span class="n">user</span><span class="p">:</span> <span class="n">User</span><span class="p">,</span> <span class="n">repo</span><span class="p">:</span> <span class="n">UserRepository</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_user_repository</span><span class="p">)):</span>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">repo</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">user</span><span class="p">)</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a>
<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/users/</span><span class="si">{user_id}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_user</span><span class="p">(</span><span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">repo</span><span class="p">:</span> <span class="n">UserRepository</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_user_repository</span><span class="p">)):</span>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a> <span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">repo</span><span class="o">.</span><span class="n">get_by_id</span><span class="p">(</span><span class="n">user_id</span><span class="p">)</span>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">user</span><span class="p">:</span>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;User not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-71" name="__codelineno-0-71" href="#__codelineno-0-71"></a> <span class="k">return</span> <span class="n">user</span>
<a id="__codelineno-0-72" name="__codelineno-0-72" href="#__codelineno-0-72"></a>
<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></a>
<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/users/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="nb">list</span><span class="p">[</span><span class="n">User</span><span class="p">])</span>
<a id="__codelineno-0-75" name="__codelineno-0-75" href="#__codelineno-0-75"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">list_users</span><span class="p">(</span>
<a id="__codelineno-0-76" name="__codelineno-0-76" href="#__codelineno-0-76"></a> <span class="n">skip</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<a id="__codelineno-0-77" name="__codelineno-0-77" href="#__codelineno-0-77"></a> <span class="n">limit</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
<a id="__codelineno-0-78" name="__codelineno-0-78" href="#__codelineno-0-78"></a> <span class="n">repo</span><span class="p">:</span> <span class="n">UserRepository</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_user_repository</span><span class="p">),</span>
<a id="__codelineno-0-79" name="__codelineno-0-79" href="#__codelineno-0-79"></a><span class="p">):</span>
<a id="__codelineno-0-80" name="__codelineno-0-80" href="#__codelineno-0-80"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">repo</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span><span class="n">skip</span><span class="o">=</span><span class="n">skip</span><span class="p">,</span> <span class="n">limit</span><span class="o">=</span><span class="n">limit</span><span class="p">)</span>
<a id="__codelineno-0-81" name="__codelineno-0-81" href="#__codelineno-0-81"></a>
<a id="__codelineno-0-82" name="__codelineno-0-82" href="#__codelineno-0-82"></a>
<a id="__codelineno-0-83" name="__codelineno-0-83" href="#__codelineno-0-83"></a><span class="nd">@app</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="s2">&quot;/users/</span><span class="si">{user_id}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-84" name="__codelineno-0-84" href="#__codelineno-0-84"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">update_user</span><span class="p">(</span>
<a id="__codelineno-0-85" name="__codelineno-0-85" href="#__codelineno-0-85"></a> <span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<a id="__codelineno-0-86" name="__codelineno-0-86" href="#__codelineno-0-86"></a> <span class="n">email</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<a id="__codelineno-0-87" name="__codelineno-0-87" href="#__codelineno-0-87"></a> <span class="n">repo</span><span class="p">:</span> <span class="n">UserRepository</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_user_repository</span><span class="p">),</span>
<a id="__codelineno-0-88" name="__codelineno-0-88" href="#__codelineno-0-88"></a><span class="p">):</span>
<a id="__codelineno-0-89" name="__codelineno-0-89" href="#__codelineno-0-89"></a> <span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">repo</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">user_id</span><span class="p">,</span> <span class="p">{</span><span class="s2">&quot;email&quot;</span><span class="p">:</span> <span class="n">email</span><span class="p">})</span>
<a id="__codelineno-0-90" name="__codelineno-0-90" href="#__codelineno-0-90"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">user</span><span class="p">:</span>
<a id="__codelineno-0-91" name="__codelineno-0-91" href="#__codelineno-0-91"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;User not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-92" name="__codelineno-0-92" href="#__codelineno-0-92"></a> <span class="k">return</span> <span class="n">user</span>
<a id="__codelineno-0-93" name="__codelineno-0-93" href="#__codelineno-0-93"></a>
<a id="__codelineno-0-94" name="__codelineno-0-94" href="#__codelineno-0-94"></a>
<a id="__codelineno-0-95" name="__codelineno-0-95" href="#__codelineno-0-95"></a><span class="nd">@app</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="s2">&quot;/users/</span><span class="si">{user_id}</span><span class="s2">&quot;</span><span class="p">)</span>
<a id="__codelineno-0-96" name="__codelineno-0-96" href="#__codelineno-0-96"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">delete_user</span><span class="p">(</span>
<a id="__codelineno-0-97" name="__codelineno-0-97" href="#__codelineno-0-97"></a> <span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
<a id="__codelineno-0-98" name="__codelineno-0-98" href="#__codelineno-0-98"></a> <span class="n">repo</span><span class="p">:</span> <span class="n">UserRepository</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_user_repository</span><span class="p">),</span>
<a id="__codelineno-0-99" name="__codelineno-0-99" href="#__codelineno-0-99"></a><span class="p">):</span>
<a id="__codelineno-0-100" name="__codelineno-0-100" href="#__codelineno-0-100"></a> <span class="n">deleted</span> <span class="o">=</span> <span class="k">await</span> <span class="n">repo</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">user_id</span><span class="p">)</span>
<a id="__codelineno-0-101" name="__codelineno-0-101" href="#__codelineno-0-101"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">deleted</span><span class="p">:</span>
<a id="__codelineno-0-102" name="__codelineno-0-102" href="#__codelineno-0-102"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;User not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-103" name="__codelineno-0-103" href="#__codelineno-0-103"></a> <span class="k">return</span> <span class="p">{</span><span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="s2">&quot;User deleted successfully&quot;</span><span class="p">}</span>
</code></pre></div>
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<h1>Custom Repo</h1>
<h3 id="use-case-2-custom-repository-with-business-logic">Use Case 2: Custom Repository with Business Logic</h3>
<p><strong>Scenario:</strong> E-commerce product catalog with custom search and filtering.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseDocument</span><span class="p">,</span> <span class="n">BaseRepository</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">List</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">Field</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="k">class</span><span class="w"> </span><span class="nc">Product</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">Field</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">min_length</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">description</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">price</span><span class="p">:</span> <span class="nb">float</span> <span class="o">=</span> <span class="n">Field</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">gt</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">category</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="n">in_stock</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> <span class="n">quantity</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="n">Field</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">ge</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">tags</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="k">class</span><span class="w"> </span><span class="nc">ProductRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">Product</span><span class="p">]):</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;products&quot;</span><span class="p">,</span> <span class="n">Product</span><span class="p">)</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">search_by_name</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">]:</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Search products by name (case-insensitive)&quot;&quot;&quot;</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a> <span class="n">docs</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">find</span><span class="p">({</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> <span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;$regex&quot;</span><span class="p">:</span> <span class="n">query</span><span class="p">,</span> <span class="s2">&quot;$options&quot;</span><span class="p">:</span> <span class="s2">&quot;i&quot;</span><span class="p">}</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a> <span class="p">})</span><span class="o">.</span><span class="n">to_list</span><span class="p">(</span><span class="n">length</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a> <span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">(</span><span class="o">**</span><span class="n">doc</span><span class="p">)</span> <span class="k">for</span> <span class="n">doc</span> <span class="ow">in</span> <span class="n">docs</span><span class="p">]</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_by_category</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">category</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">in_stock_only</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">]:</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get products by category&quot;&quot;&quot;</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a> <span class="n">filter_query</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;category&quot;</span><span class="p">:</span> <span class="n">category</span><span class="p">}</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a> <span class="k">if</span> <span class="n">in_stock_only</span><span class="p">:</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="n">filter_query</span><span class="p">[</span><span class="s2">&quot;in_stock&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span><span class="nb">filter</span><span class="o">=</span><span class="n">filter_query</span><span class="p">)</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_low_stock</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">threshold</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">]:</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get products with low stock&quot;&quot;&quot;</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a> <span class="nb">filter</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;quantity&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;$lt&quot;</span><span class="p">:</span> <span class="n">threshold</span><span class="p">},</span> <span class="s2">&quot;in_stock&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">}</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a> <span class="p">)</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">update_stock</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">product_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">quantity_delta</span><span class="p">:</span> <span class="nb">int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Product</span><span class="p">]:</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Update product stock (increment/decrement)&quot;&quot;&quot;</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a> <span class="n">result</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">find_one_and_update</span><span class="p">(</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a> <span class="p">{</span><span class="s2">&quot;_id&quot;</span><span class="p">:</span> <span class="n">ObjectId</span><span class="p">(</span><span class="n">product_id</span><span class="p">)},</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a> <span class="p">{</span><span class="s2">&quot;$inc&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;quantity&quot;</span><span class="p">:</span> <span class="n">quantity_delta</span><span class="p">},</span> <span class="s2">&quot;$set&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;updated_at&quot;</span><span class="p">:</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()}},</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="n">return_document</span><span class="o">=</span><span class="kc">True</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a> <span class="p">)</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">model</span><span class="p">(</span><span class="o">**</span><span class="n">result</span><span class="p">)</span> <span class="k">if</span> <span class="n">result</span> <span class="k">else</span> <span class="kc">None</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="c1"># Usage in FastAPI</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">FastAPI</span><span class="p">,</span> <span class="n">Query</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="n">app</span> <span class="o">=</span> <span class="n">FastAPI</span><span class="p">()</span>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="n">product_repo</span> <span class="o">=</span> <span class="n">ProductRepository</span><span class="p">()</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/products/search&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">])</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">search_products</span><span class="p">(</span><span class="n">q</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">Query</span><span class="p">(</span><span class="o">...</span><span class="p">,</span> <span class="n">min_length</span><span class="o">=</span><span class="mi">1</span><span class="p">)):</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">product_repo</span><span class="o">.</span><span class="n">search_by_name</span><span class="p">(</span><span class="n">q</span><span class="p">)</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/products/category/</span><span class="si">{category}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">])</span>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">products_by_category</span><span class="p">(</span><span class="n">category</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">in_stock</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">):</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">product_repo</span><span class="o">.</span><span class="n">get_by_category</span><span class="p">(</span><span class="n">category</span><span class="p">,</span> <span class="n">in_stock</span><span class="p">)</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/products/low-stock&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">Product</span><span class="p">])</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">low_stock_products</span><span class="p">(</span><span class="n">threshold</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">):</span>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">product_repo</span><span class="o">.</span><span class="n">get_low_stock</span><span class="p">(</span><span class="n">threshold</span><span class="p">)</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a><span class="nd">@app</span><span class="o">.</span><span class="n">patch</span><span class="p">(</span><span class="s2">&quot;/products/</span><span class="si">{product_id}</span><span class="s2">/stock&quot;</span><span class="p">)</span>
<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">update_product_stock</span><span class="p">(</span><span class="n">product_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">quantity_delta</span><span class="p">:</span> <span class="nb">int</span><span class="p">):</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a> <span class="n">product</span> <span class="o">=</span> <span class="k">await</span> <span class="n">product_repo</span><span class="o">.</span><span class="n">update_stock</span><span class="p">(</span><span class="n">product_id</span><span class="p">,</span> <span class="n">quantity_delta</span><span class="p">)</span>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">product</span><span class="p">:</span>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;Product not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a> <span class="k">return</span> <span class="n">product</span>
</code></pre></div>
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<h1>Transactions</h1>
<h3 id="use-case-3-transaction-support-for-multi-document-operations">Use Case 3: Transaction Support for Multi-Document Operations</h3>
<p><strong>Scenario:</strong> Order processing system that updates inventory and creates order atomically.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseDocument</span><span class="p">,</span> <span class="n">BaseRepository</span><span class="p">,</span> <span class="n">TransactionManager</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">datetime</span><span class="w"> </span><span class="kn">import</span> <span class="n">datetime</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">List</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">Field</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">class</span><span class="w"> </span><span class="nc">Order</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">items</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">dict</span><span class="p">]</span> <span class="c1"># [{&quot;product_id&quot;: &quot;...&quot;, &quot;quantity&quot;: 2}]</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">total_amount</span><span class="p">:</span> <span class="nb">float</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="n">status</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;pending&quot;</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="k">class</span><span class="w"> </span><span class="nc">OrderRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">Order</span><span class="p">]):</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;orders&quot;</span><span class="p">,</span> <span class="n">Order</span><span class="p">)</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="k">class</span><span class="w"> </span><span class="nc">OrderService</span><span class="p">:</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">order_repo</span><span class="p">:</span> <span class="n">OrderRepository</span><span class="p">,</span> <span class="n">product_repo</span><span class="p">:</span> <span class="n">ProductRepository</span><span class="p">):</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="bp">self</span><span class="o">.</span><span class="n">order_repo</span> <span class="o">=</span> <span class="n">order_repo</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a> <span class="bp">self</span><span class="o">.</span><span class="n">product_repo</span> <span class="o">=</span> <span class="n">product_repo</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_order_with_inventory_update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">order</span><span class="p">:</span> <span class="n">Order</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Order</span><span class="p">:</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Create order and update inventory atomically&quot;&quot;&quot;</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_order_transaction</span><span class="p">(</span><span class="n">session</span><span class="p">):</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="c1"># Insert order</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> <span class="n">order_doc</span> <span class="o">=</span> <span class="n">order</span><span class="o">.</span><span class="n">model_dump</span><span class="p">(</span><span class="n">exclude</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;id&quot;</span><span class="p">},</span> <span class="n">exclude_none</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a> <span class="n">order_doc</span><span class="p">[</span><span class="s2">&quot;created_at&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a> <span class="n">order_doc</span><span class="p">[</span><span class="s2">&quot;updated_at&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="n">result</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">order_repo</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">insert_one</span><span class="p">(</span><span class="n">order_doc</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">)</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a> <span class="c1"># Update inventory for each item</span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a> <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">order</span><span class="o">.</span><span class="n">items</span><span class="p">:</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">product_repo</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">update_one</span><span class="p">(</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a> <span class="p">{</span><span class="s2">&quot;_id&quot;</span><span class="p">:</span> <span class="n">ObjectId</span><span class="p">(</span><span class="n">item</span><span class="p">[</span><span class="s2">&quot;product_id&quot;</span><span class="p">])},</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a> <span class="p">{</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a> <span class="s2">&quot;$inc&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;quantity&quot;</span><span class="p">:</span> <span class="o">-</span><span class="n">item</span><span class="p">[</span><span class="s2">&quot;quantity&quot;</span><span class="p">]},</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a> <span class="s2">&quot;$set&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;updated_at&quot;</span><span class="p">:</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()}</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a> <span class="p">},</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a> <span class="n">session</span><span class="o">=</span><span class="n">session</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a> <span class="p">)</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a> <span class="c1"># Fetch created order</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="n">created</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">order_repo</span><span class="o">.</span><span class="n">collection</span><span class="o">.</span><span class="n">find_one</span><span class="p">(</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a> <span class="p">{</span><span class="s2">&quot;_id&quot;</span><span class="p">:</span> <span class="n">result</span><span class="o">.</span><span class="n">inserted_id</span><span class="p">},</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a> <span class="n">session</span><span class="o">=</span><span class="n">session</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a> <span class="p">)</span>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a> <span class="k">return</span> <span class="n">Order</span><span class="p">(</span><span class="o">**</span><span class="n">created</span><span class="p">)</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a> <span class="c1"># Execute in transaction</span>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">TransactionManager</span><span class="o">.</span><span class="n">start_session</span><span class="p">()</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">create_order_transaction</span><span class="p">(</span><span class="n">session</span><span class="p">)</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a><span class="c1"># Usage in FastAPI</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/orders/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">Order</span><span class="p">)</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_order</span><span class="p">(</span><span class="n">order</span><span class="p">:</span> <span class="n">Order</span><span class="p">):</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a> <span class="n">order_service</span> <span class="o">=</span> <span class="n">OrderService</span><span class="p">(</span><span class="n">order_repo</span><span class="p">,</span> <span class="n">product_repo</span><span class="p">)</span>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a> <span class="k">try</span><span class="p">:</span>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">order_service</span><span class="o">.</span><span class="n">create_order_with_inventory_update</span><span class="p">(</span><span class="n">order</span><span class="p">)</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a> <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">400</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
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<h1>Pagination</h1>
<h3 id="use-case-4-pagination-filtering">Use Case 4: Pagination &amp; Filtering</h3>
<p><strong>Scenario:</strong> Blog post API with pagination and filtering.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseDocument</span><span class="p">,</span> <span class="n">BaseRepository</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">pydantic</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseModel</span><span class="p">,</span> <span class="n">Field</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">List</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Generic</span><span class="p">,</span> <span class="n">TypeVar</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="n">T</span> <span class="o">=</span> <span class="n">TypeVar</span><span class="p">(</span><span class="s2">&quot;T&quot;</span><span class="p">)</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="k">class</span><span class="w"> </span><span class="nc">PaginatedResponse</span><span class="p">(</span><span class="n">BaseModel</span><span class="p">,</span> <span class="n">Generic</span><span class="p">[</span><span class="n">T</span><span class="p">]):</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">items</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">T</span><span class="p">]</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">total</span><span class="p">:</span> <span class="nb">int</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="n">page</span><span class="p">:</span> <span class="nb">int</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> <span class="n">page_size</span><span class="p">:</span> <span class="nb">int</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">total_pages</span><span class="p">:</span> <span class="nb">int</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">has_next</span><span class="p">:</span> <span class="nb">bool</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">has_prev</span><span class="p">:</span> <span class="nb">bool</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="k">class</span><span class="w"> </span><span class="nc">BlogPost</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="n">title</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="n">content</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a> <span class="n">author_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a> <span class="n">published</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> <span class="n">tags</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a> <span class="n">views</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="k">class</span><span class="w"> </span><span class="nc">BlogPostRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">]):</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;blog_posts&quot;</span><span class="p">,</span> <span class="n">BlogPost</span><span class="p">)</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">paginate</span><span class="p">(</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="bp">self</span><span class="p">,</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a> <span class="n">page</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a> <span class="n">page_size</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a> <span class="n">filter_dict</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">dict</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a> <span class="n">sort_by</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;created_at&quot;</span><span class="p">,</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a> <span class="n">sort_order</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a> <span class="p">)</span> <span class="o">-&gt;</span> <span class="n">PaginatedResponse</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">]:</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get paginated blog posts&quot;&quot;&quot;</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a> <span class="n">filter_dict</span> <span class="o">=</span> <span class="n">filter_dict</span> <span class="ow">or</span> <span class="p">{}</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a> <span class="n">skip</span> <span class="o">=</span> <span class="p">(</span><span class="n">page</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">*</span> <span class="n">page_size</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a> <span class="c1"># Get total count</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a> <span class="n">total</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">count</span><span class="p">(</span><span class="n">filter_dict</span><span class="p">)</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="c1"># Get items</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a> <span class="n">items</span> <span class="o">=</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a> <span class="nb">filter</span><span class="o">=</span><span class="n">filter_dict</span><span class="p">,</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a> <span class="n">skip</span><span class="o">=</span><span class="n">skip</span><span class="p">,</span>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a> <span class="n">limit</span><span class="o">=</span><span class="n">page_size</span><span class="p">,</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a> <span class="n">sort</span><span class="o">=</span><span class="p">[(</span><span class="n">sort_by</span><span class="p">,</span> <span class="n">sort_order</span><span class="p">)]</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a> <span class="p">)</span>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a> <span class="n">total_pages</span> <span class="o">=</span> <span class="p">(</span><span class="n">total</span> <span class="o">+</span> <span class="n">page_size</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">//</span> <span class="n">page_size</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a> <span class="k">return</span> <span class="n">PaginatedResponse</span><span class="p">(</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a> <span class="n">items</span><span class="o">=</span><span class="n">items</span><span class="p">,</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a> <span class="n">total</span><span class="o">=</span><span class="n">total</span><span class="p">,</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a> <span class="n">page</span><span class="o">=</span><span class="n">page</span><span class="p">,</span>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a> <span class="n">page_size</span><span class="o">=</span><span class="n">page_size</span><span class="p">,</span>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a> <span class="n">total_pages</span><span class="o">=</span><span class="n">total_pages</span><span class="p">,</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a> <span class="n">has_next</span><span class="o">=</span><span class="n">page</span> <span class="o">&lt;</span> <span class="n">total_pages</span><span class="p">,</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a> <span class="n">has_prev</span><span class="o">=</span><span class="n">page</span> <span class="o">&gt;</span> <span class="mi">1</span>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a> <span class="p">)</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_by_author</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">author_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">published_only</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">):</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get posts by author&quot;&quot;&quot;</span>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a> <span class="n">filter_dict</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;author_id&quot;</span><span class="p">:</span> <span class="n">author_id</span><span class="p">}</span>
<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a> <span class="k">if</span> <span class="n">published_only</span><span class="p">:</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a> <span class="n">filter_dict</span><span class="p">[</span><span class="s2">&quot;published&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span><span class="nb">filter</span><span class="o">=</span><span class="n">filter_dict</span><span class="p">,</span> <span class="n">sort</span><span class="o">=</span><span class="p">[(</span><span class="s2">&quot;created_at&quot;</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">)])</span>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">search_by_tags</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tags</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="n">List</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">]:</span>
<a id="__codelineno-0-71" name="__codelineno-0-71" href="#__codelineno-0-71"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Search posts by tags&quot;&quot;&quot;</span>
<a id="__codelineno-0-72" name="__codelineno-0-72" href="#__codelineno-0-72"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span><span class="nb">filter</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;tags&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;$in&quot;</span><span class="p">:</span> <span class="n">tags</span><span class="p">},</span> <span class="s2">&quot;published&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">})</span>
<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></a>
<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a><span class="c1"># Usage in FastAPI</span>
<a id="__codelineno-0-75" name="__codelineno-0-75" href="#__codelineno-0-75"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/posts/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">PaginatedResponse</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">])</span>
<a id="__codelineno-0-76" name="__codelineno-0-76" href="#__codelineno-0-76"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">list_posts</span><span class="p">(</span>
<a id="__codelineno-0-77" name="__codelineno-0-77" href="#__codelineno-0-77"></a> <span class="n">page</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<a id="__codelineno-0-78" name="__codelineno-0-78" href="#__codelineno-0-78"></a> <span class="n">page_size</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
<a id="__codelineno-0-79" name="__codelineno-0-79" href="#__codelineno-0-79"></a> <span class="n">published</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<a id="__codelineno-0-80" name="__codelineno-0-80" href="#__codelineno-0-80"></a> <span class="n">author_id</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>
<a id="__codelineno-0-81" name="__codelineno-0-81" href="#__codelineno-0-81"></a><span class="p">):</span>
<a id="__codelineno-0-82" name="__codelineno-0-82" href="#__codelineno-0-82"></a> <span class="n">filter_dict</span> <span class="o">=</span> <span class="p">{}</span>
<a id="__codelineno-0-83" name="__codelineno-0-83" href="#__codelineno-0-83"></a> <span class="k">if</span> <span class="n">published</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<a id="__codelineno-0-84" name="__codelineno-0-84" href="#__codelineno-0-84"></a> <span class="n">filter_dict</span><span class="p">[</span><span class="s2">&quot;published&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">published</span>
<a id="__codelineno-0-85" name="__codelineno-0-85" href="#__codelineno-0-85"></a> <span class="k">if</span> <span class="n">author_id</span><span class="p">:</span>
<a id="__codelineno-0-86" name="__codelineno-0-86" href="#__codelineno-0-86"></a> <span class="n">filter_dict</span><span class="p">[</span><span class="s2">&quot;author_id&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">author_id</span>
<a id="__codelineno-0-87" name="__codelineno-0-87" href="#__codelineno-0-87"></a>
<a id="__codelineno-0-88" name="__codelineno-0-88" href="#__codelineno-0-88"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">blog_repo</span><span class="o">.</span><span class="n">paginate</span><span class="p">(</span><span class="n">page</span><span class="p">,</span> <span class="n">page_size</span><span class="p">,</span> <span class="n">filter_dict</span><span class="p">)</span>
<a id="__codelineno-0-89" name="__codelineno-0-89" href="#__codelineno-0-89"></a>
<a id="__codelineno-0-90" name="__codelineno-0-90" href="#__codelineno-0-90"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/posts/author/</span><span class="si">{author_id}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">])</span>
<a id="__codelineno-0-91" name="__codelineno-0-91" href="#__codelineno-0-91"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">posts_by_author</span><span class="p">(</span><span class="n">author_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">published</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span><span class="p">):</span>
<a id="__codelineno-0-92" name="__codelineno-0-92" href="#__codelineno-0-92"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">blog_repo</span><span class="o">.</span><span class="n">get_by_author</span><span class="p">(</span><span class="n">author_id</span><span class="p">,</span> <span class="n">published</span><span class="p">)</span>
<a id="__codelineno-0-93" name="__codelineno-0-93" href="#__codelineno-0-93"></a>
<a id="__codelineno-0-94" name="__codelineno-0-94" href="#__codelineno-0-94"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/posts/tags&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">BlogPost</span><span class="p">])</span>
<a id="__codelineno-0-95" name="__codelineno-0-95" href="#__codelineno-0-95"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">posts_by_tags</span><span class="p">(</span><span class="n">tags</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="n">Query</span><span class="p">(</span><span class="o">...</span><span class="p">)):</span>
<a id="__codelineno-0-96" name="__codelineno-0-96" href="#__codelineno-0-96"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">blog_repo</span><span class="o">.</span><span class="n">search_by_tags</span><span class="p">(</span><span class="n">tags</span><span class="p">)</span>
</code></pre></div>
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<h1>Soft Deletes</h1>
<h3 id="use-case-5-soft-deletes-pattern">Use Case 5: Soft Deletes Pattern</h3>
<p><strong>Scenario:</strong> Implement soft delete functionality for data recovery.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="n">BaseDocument</span><span class="p">,</span> <span class="n">BaseRepository</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">datetime</span><span class="w"> </span><span class="kn">import</span> <span class="n">datetime</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">Optional</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="k">class</span><span class="w"> </span><span class="nc">SoftDeleteDocument</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Base document with soft delete support&quot;&quot;&quot;</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="n">is_deleted</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">deleted_at</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">datetime</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">deleted_by</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="k">class</span><span class="w"> </span><span class="nc">Task</span><span class="p">(</span><span class="n">SoftDeleteDocument</span><span class="p">):</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">title</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">description</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">assignee_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> <span class="n">status</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;pending&quot;</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="n">priority</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;medium&quot;</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="k">class</span><span class="w"> </span><span class="nc">SoftDeleteRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">T</span><span class="p">]):</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Repository with soft delete operations&quot;&quot;&quot;</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">soft_delete</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">deleted_by</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Optional</span><span class="p">[</span><span class="n">T</span><span class="p">]:</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Soft delete a document&quot;&quot;&quot;</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="nb">id</span><span class="p">,</span> <span class="p">{</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a> <span class="s2">&quot;is_deleted&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="s2">&quot;deleted_at&quot;</span><span class="p">:</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcnow</span><span class="p">(),</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> <span class="s2">&quot;deleted_by&quot;</span><span class="p">:</span> <span class="n">deleted_by</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a> <span class="p">})</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">restore</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Optional</span><span class="p">[</span><span class="n">T</span><span class="p">]:</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Restore a soft-deleted document&quot;&quot;&quot;</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="nb">id</span><span class="p">,</span> <span class="p">{</span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a> <span class="s2">&quot;is_deleted&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a> <span class="s2">&quot;deleted_at&quot;</span><span class="p">:</span> <span class="kc">None</span><span class="p">,</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a> <span class="s2">&quot;deleted_by&quot;</span><span class="p">:</span> <span class="kc">None</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a> <span class="p">})</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_active</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">skip</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">limit</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">100</span><span class="p">):</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get only non-deleted documents&quot;&quot;&quot;</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a> <span class="nb">filter</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;is_deleted&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">},</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a> <span class="n">skip</span><span class="o">=</span><span class="n">skip</span><span class="p">,</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a> <span class="n">limit</span><span class="o">=</span><span class="n">limit</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="p">)</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_deleted</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">skip</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">limit</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">100</span><span class="p">):</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Get deleted documents&quot;&quot;&quot;</span>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a> <span class="nb">filter</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;is_deleted&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">},</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a> <span class="n">skip</span><span class="o">=</span><span class="n">skip</span><span class="p">,</span>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a> <span class="n">limit</span><span class="o">=</span><span class="n">limit</span>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a> <span class="p">)</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">permanent_delete</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Permanently delete a document&quot;&quot;&quot;</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a> <span class="k">return</span> <span class="k">await</span> <span class="bp">self</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="nb">id</span><span class="p">)</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a><span class="k">class</span><span class="w"> </span><span class="nc">TaskRepository</span><span class="p">(</span><span class="n">SoftDeleteRepository</span><span class="p">[</span><span class="n">Task</span><span class="p">]):</span>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;tasks&quot;</span><span class="p">,</span> <span class="n">Task</span><span class="p">)</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="c1"># Usage in FastAPI</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a><span class="nd">@app</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="s2">&quot;/tasks/</span><span class="si">{task_id}</span><span class="s2">&quot;</span><span class="p">)</span>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">soft_delete_task</span><span class="p">(</span><span class="n">task_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a> <span class="n">task</span> <span class="o">=</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">soft_delete</span><span class="p">(</span><span class="n">task_id</span><span class="p">,</span> <span class="n">deleted_by</span><span class="o">=</span><span class="n">user_id</span><span class="p">)</span>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">task</span><span class="p">:</span>
<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;Task not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a> <span class="k">return</span> <span class="p">{</span><span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="s2">&quot;Task deleted&quot;</span><span class="p">,</span> <span class="s2">&quot;task&quot;</span><span class="p">:</span> <span class="n">task</span><span class="p">}</span>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/tasks/</span><span class="si">{task_id}</span><span class="s2">/restore&quot;</span><span class="p">)</span>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">restore_task</span><span class="p">(</span><span class="n">task_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
<a id="__codelineno-0-71" name="__codelineno-0-71" href="#__codelineno-0-71"></a> <span class="n">task</span> <span class="o">=</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">restore</span><span class="p">(</span><span class="n">task_id</span><span class="p">)</span>
<a id="__codelineno-0-72" name="__codelineno-0-72" href="#__codelineno-0-72"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">task</span><span class="p">:</span>
<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></a> <span class="k">raise</span> <span class="n">HTTPException</span><span class="p">(</span><span class="n">status_code</span><span class="o">=</span><span class="mi">404</span><span class="p">,</span> <span class="n">detail</span><span class="o">=</span><span class="s2">&quot;Task not found&quot;</span><span class="p">)</span>
<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a> <span class="k">return</span> <span class="p">{</span><span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="s2">&quot;Task restored&quot;</span><span class="p">,</span> <span class="s2">&quot;task&quot;</span><span class="p">:</span> <span class="n">task</span><span class="p">}</span>
<a id="__codelineno-0-75" name="__codelineno-0-75" href="#__codelineno-0-75"></a>
<a id="__codelineno-0-76" name="__codelineno-0-76" href="#__codelineno-0-76"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/tasks/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">Task</span><span class="p">])</span>
<a id="__codelineno-0-77" name="__codelineno-0-77" href="#__codelineno-0-77"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">list_active_tasks</span><span class="p">(</span><span class="n">skip</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">limit</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">):</span>
<a id="__codelineno-0-78" name="__codelineno-0-78" href="#__codelineno-0-78"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">get_active</span><span class="p">(</span><span class="n">skip</span><span class="p">,</span> <span class="n">limit</span><span class="p">)</span>
<a id="__codelineno-0-79" name="__codelineno-0-79" href="#__codelineno-0-79"></a>
<a id="__codelineno-0-80" name="__codelineno-0-80" href="#__codelineno-0-80"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/tasks/deleted&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">List</span><span class="p">[</span><span class="n">Task</span><span class="p">])</span>
<a id="__codelineno-0-81" name="__codelineno-0-81" href="#__codelineno-0-81"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">list_deleted_tasks</span><span class="p">(</span><span class="n">skip</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">limit</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">10</span><span class="p">):</span>
<a id="__codelineno-0-82" name="__codelineno-0-82" href="#__codelineno-0-82"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">get_deleted</span><span class="p">(</span><span class="n">skip</span><span class="p">,</span> <span class="n">limit</span><span class="p">)</span>
</code></pre></div>
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<h1>Multi Model</h1>
<h3 id="use-case-6-multi-model-service-with-registration">Use Case 6: Multi-Model Service with Registration</h3>
<p><strong>Scenario:</strong> Complete microservice with multiple related models.</p>
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">MongoConnectionManager</span><span class="p">,</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> <span class="n">BaseDocument</span><span class="p">,</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> <span class="n">BaseRepository</span><span class="p">,</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="n">ModelRegistry</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">)</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">FastAPI</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="kn">from</span><span class="w"> </span><span class="nn">contextlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">asynccontextmanager</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="c1"># Define Models</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="k">class</span><span class="w"> </span><span class="nc">User</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="n">username</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">email</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">role</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;user&quot;</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="k">class</span><span class="w"> </span><span class="nc">Post</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="n">title</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="n">content</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a> <span class="n">author_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a> <span class="n">likes</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="k">class</span><span class="w"> </span><span class="nc">Comment</span><span class="p">(</span><span class="n">BaseDocument</span><span class="p">):</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a> <span class="n">post_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a> <span class="n">user_id</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a> <span class="n">content</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="c1"># Define Repositories</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="k">class</span><span class="w"> </span><span class="nc">UserRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">User</span><span class="p">]):</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;users&quot;</span><span class="p">,</span> <span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="k">class</span><span class="w"> </span><span class="nc">PostRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">Post</span><span class="p">]):</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;posts&quot;</span><span class="p">,</span> <span class="n">Post</span><span class="p">)</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="k">class</span><span class="w"> </span><span class="nc">CommentRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">Comment</span><span class="p">]):</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a> <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="s2">&quot;comments&quot;</span><span class="p">,</span> <span class="n">Comment</span><span class="p">)</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="c1"># Register all models</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="n">ModelRegistry</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="s2">&quot;users&quot;</span><span class="p">,</span> <span class="n">User</span><span class="p">,</span> <span class="n">indexes</span><span class="o">=</span><span class="p">[(</span><span class="s2">&quot;email&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="p">(</span><span class="s2">&quot;username&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)])</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="n">ModelRegistry</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="s2">&quot;posts&quot;</span><span class="p">,</span> <span class="n">Post</span><span class="p">,</span> <span class="n">indexes</span><span class="o">=</span><span class="p">[(</span><span class="s2">&quot;author_id&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="p">(</span><span class="s2">&quot;created_at&quot;</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">)])</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="n">ModelRegistry</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="s2">&quot;comments&quot;</span><span class="p">,</span> <span class="n">Comment</span><span class="p">,</span> <span class="n">indexes</span><span class="o">=</span><span class="p">[(</span><span class="s2">&quot;post_id&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">),</span> <span class="p">(</span><span class="s2">&quot;user_id&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)])</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="c1"># Setup FastAPI with lifespan</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="nd">@asynccontextmanager</span>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">lifespan</span><span class="p">(</span><span class="n">app</span><span class="p">:</span> <span class="n">FastAPI</span><span class="p">):</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a> <span class="k">await</span> <span class="n">MongoConnectionManager</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a> <span class="n">uri</span><span class="o">=</span><span class="s2">&quot;mongodb://localhost:27017&quot;</span><span class="p">,</span>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a> <span class="n">db_name</span><span class="o">=</span><span class="s2">&quot;social_app&quot;</span>
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a> <span class="p">)</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a> <span class="k">await</span> <span class="n">ModelRegistry</span><span class="o">.</span><span class="n">initialize_all</span><span class="p">()</span>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a> <span class="k">yield</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a> <span class="k">await</span> <span class="n">MongoConnectionManager</span><span class="o">.</span><span class="n">disconnect</span><span class="p">()</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a><span class="n">app</span> <span class="o">=</span> <span class="n">FastAPI</span><span class="p">(</span><span class="n">lifespan</span><span class="o">=</span><span class="n">lifespan</span><span class="p">)</span>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="c1"># Initialize repositories</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a><span class="n">user_repo</span> <span class="o">=</span> <span class="n">UserRepository</span><span class="p">()</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a><span class="n">post_repo</span> <span class="o">=</span> <span class="n">PostRepository</span><span class="p">()</span>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="n">comment_repo</span> <span class="o">=</span> <span class="n">CommentRepository</span><span class="p">()</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a><span class="c1"># Endpoints</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/users/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">User</span><span class="p">)</span>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_user</span><span class="p">(</span><span class="n">user</span><span class="p">:</span> <span class="n">User</span><span class="p">):</span>
<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">user_repo</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">user</span><span class="p">)</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/posts/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">Post</span><span class="p">)</span>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_post</span><span class="p">(</span><span class="n">post</span><span class="p">:</span> <span class="n">Post</span><span class="p">):</span>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">post_repo</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">post</span><span class="p">)</span>
<a id="__codelineno-0-71" name="__codelineno-0-71" href="#__codelineno-0-71"></a>
<a id="__codelineno-0-72" name="__codelineno-0-72" href="#__codelineno-0-72"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/comments/&quot;</span><span class="p">,</span> <span class="n">response_model</span><span class="o">=</span><span class="n">Comment</span><span class="p">)</span>
<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">create_comment</span><span class="p">(</span><span class="n">comment</span><span class="p">:</span> <span class="n">Comment</span><span class="p">):</span>
<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a> <span class="k">return</span> <span class="k">await</span> <span class="n">comment_repo</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">comment</span><span class="p">)</span>
</code></pre></div>
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