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<h1 id="use-case-19-bulk-operations">Use Case 19: Bulk Operations</h1>
<p><strong>Scenario:</strong> A background job needs to update or delete hundreds of documents in one call — doing it one-by-one would be prohibitively slow.</p>
<hr />
<h2 id="whats-new">📦 What's New?</h2>
<table>
<thead>
<tr>
<th>Component</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>update_many</code> / <code>delete_many</code></td>
<td>Motor's multi-document write operations.</td>
</tr>
<tr>
<td>Repository wrapper</td>
<td>Keeps bulk logic behind a domain method so callers pass IDs and business parameters, not raw dicts.</td>
</tr>
<tr>
<td><code>BulkWriteError</code></td>
<td>Raised when <code>ordered=False</code> and some operations fail — catch it for partial-success handling.</td>
</tr>
</tbody>
</table>
<hr />
<h2 id="example">🚀 Example</h2>
<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">datetime</span><span class="w"> </span><span class="kn">import</span> <span class="n">datetime</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
<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">bson</span><span class="w"> </span><span class="kn">import</span> <span class="n">ObjectId</span><span class="p">,</span> <span class="n">BulkWriteError</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">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">FastAPI</span><span class="p">,</span> <span class="n">HTTPException</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="n">BaseDocument</span><span class="p">,</span> <span class="n">BaseRepository</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>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="c1"># Model</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="c1"># ---------------------------</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">Task</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">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-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">assignee_id</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="kc">None</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">priority</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">0</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>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="c1"># Repository</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="c1"># ---------------------------</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="k">class</span><span class="w"> </span><span class="nc">TaskRepository</span><span class="p">(</span><span class="n">BaseRepository</span><span class="p">[</span><span class="n">Task</span><span class="p">]):</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></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-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></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-0-23" 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">bulk_update_status</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ids</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">],</span> <span class="n">status</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Set status on many tasks at once. Returns the count of modified documents.&quot;&quot;&quot;</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> <span class="n">object_ids</span> <span class="o">=</span> <span class="p">[</span><span class="n">ObjectId</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">ids</span><span class="p">]</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></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">update_many</span><span class="p">(</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a> <span class="p">{</span><span class="s2">&quot;_id&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;$in&quot;</span><span class="p">:</span> <span class="n">object_ids</span><span class="p">}},</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a> <span class="p">{</span><span class="s2">&quot;$set&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;status&quot;</span><span class="p">:</span> <span class="n">status</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-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a> <span class="p">)</span>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a> <span class="k">return</span> <span class="n">result</span><span class="o">.</span><span class="n">modified_count</span>
<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="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">bulk_reassign</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">old_assignee</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">new_assignee</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Move all pending tasks from one assignee to another.&quot;&quot;&quot;</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></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">update_many</span><span class="p">(</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a> <span class="p">{</span><span class="s2">&quot;assignee_id&quot;</span><span class="p">:</span> <span class="n">old_assignee</span><span class="p">,</span> <span class="s2">&quot;status&quot;</span><span class="p">:</span> <span class="s2">&quot;pending&quot;</span><span class="p">},</span>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a> <span class="p">{</span><span class="s2">&quot;$set&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;assignee_id&quot;</span><span class="p">:</span> <span class="n">new_assignee</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="k">return</span> <span class="n">result</span><span class="o">.</span><span class="n">modified_count</span>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">bulk_archive</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ids</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Delete many tasks at once. Returns the count of deleted documents.&quot;&quot;&quot;</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a> <span class="n">object_ids</span> <span class="o">=</span> <span class="p">[</span><span class="n">ObjectId</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">ids</span><span class="p">]</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></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">delete_many</span><span class="p">({</span><span class="s2">&quot;_id&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;$in&quot;</span><span class="p">:</span> <span class="n">object_ids</span><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="n">result</span><span class="o">.</span><span class="n">deleted_count</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="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">bulk_upsert_users</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">records</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">dict</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="nb">dict</span><span class="p">:</span>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a><span class="w"> </span><span class="sd">&quot;&quot;&quot;Insert-or-update many user records. Returns inserted/modified counts.&quot;&quot;&quot;</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a> <span class="kn">from</span><span class="w"> </span><span class="nn">pymongo</span><span class="w"> </span><span class="kn">import</span> <span class="n">UpdateOne</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">ops</span> <span class="o">=</span> <span class="p">[</span>
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a> <span class="n">UpdateOne</span><span class="p">(</span>
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a> <span class="p">{</span><span class="s2">&quot;email&quot;</span><span class="p">:</span> <span class="n">rec</span><span class="p">[</span><span class="s2">&quot;email&quot;</span><span class="p">]},</span>
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a> <span class="p">{</span><span class="s2">&quot;$set&quot;</span><span class="p">:</span> <span class="n">rec</span><span class="p">},</span>
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a> <span class="n">upsert</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a> <span class="p">)</span>
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a> <span class="k">for</span> <span class="n">rec</span> <span class="ow">in</span> <span class="n">records</span>
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a> <span class="p">]</span>
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a> <span class="k">try</span><span class="p">:</span>
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></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">bulk_write</span><span class="p">(</span><span class="n">ops</span><span class="p">,</span> <span class="n">ordered</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a> <span class="k">return</span> <span class="p">{</span>
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a> <span class="s2">&quot;inserted&quot;</span><span class="p">:</span> <span class="n">result</span><span class="o">.</span><span class="n">upserted_count</span><span class="p">,</span>
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a> <span class="s2">&quot;modified&quot;</span><span class="p">:</span> <span class="n">result</span><span class="o">.</span><span class="n">modified_count</span><span class="p">,</span>
<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a> <span class="p">}</span>
<a id="__codelineno-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a> <span class="k">except</span> <span class="n">BulkWriteError</span> <span class="k">as</span> <span class="n">exc</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="p">{</span>
<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></a> <span class="s2">&quot;inserted&quot;</span><span class="p">:</span> <span class="n">exc</span><span class="o">.</span><span class="n">details</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;upsertedCount&quot;</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span>
<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a> <span class="s2">&quot;modified&quot;</span><span class="p">:</span> <span class="n">exc</span><span class="o">.</span><span class="n">details</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;modifiedCount&quot;</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span>
<a id="__codelineno-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a> <span class="s2">&quot;errors&quot;</span><span class="p">:</span> <span class="n">exc</span><span class="o">.</span><span class="n">details</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;writeErrors&quot;</span><span class="p">,</span> <span class="p">[]),</span>
<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a> <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>
<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></a><span class="n">app</span> <span class="o">=</span> <span class="n">FastAPI</span><span class="p">()</span>
<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a><span class="n">task_repo</span> <span class="o">=</span> <span class="n">TaskRepository</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>
<a id="__codelineno-0-77" name="__codelineno-0-77" href="#__codelineno-0-77"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/tasks/bulk-status&quot;</span><span class="p">)</span>
<a id="__codelineno-0-78" name="__codelineno-0-78" href="#__codelineno-0-78"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">bulk_status</span><span class="p">(</span><span class="n">ids</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">],</span> <span class="n">status</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
<a id="__codelineno-0-79" name="__codelineno-0-79" href="#__codelineno-0-79"></a> <span class="n">count</span> <span class="o">=</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">bulk_update_status</span><span class="p">(</span><span class="n">ids</span><span class="p">,</span> <span class="n">status</span><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="p">{</span><span class="s2">&quot;modified&quot;</span><span class="p">:</span> <span class="n">count</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">post</span><span class="p">(</span><span class="s2">&quot;/tasks/bulk-reassign&quot;</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">reassign</span><span class="p">(</span><span class="n">old_assignee</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">new_assignee</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
<a id="__codelineno-0-85" name="__codelineno-0-85" href="#__codelineno-0-85"></a> <span class="n">count</span> <span class="o">=</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">bulk_reassign</span><span class="p">(</span><span class="n">old_assignee</span><span class="p">,</span> <span class="n">new_assignee</span><span class="p">)</span>
<a id="__codelineno-0-86" name="__codelineno-0-86" href="#__codelineno-0-86"></a> <span class="k">return</span> <span class="p">{</span><span class="s2">&quot;modified&quot;</span><span class="p">:</span> <span class="n">count</span><span class="p">}</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>
<a id="__codelineno-0-89" name="__codelineno-0-89" href="#__codelineno-0-89"></a><span class="nd">@app</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/tasks/bulk-archive&quot;</span><span class="p">)</span>
<a id="__codelineno-0-90" name="__codelineno-0-90" href="#__codelineno-0-90"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">archive</span><span class="p">(</span><span class="n">ids</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]):</span>
<a id="__codelineno-0-91" name="__codelineno-0-91" href="#__codelineno-0-91"></a> <span class="n">count</span> <span class="o">=</span> <span class="k">await</span> <span class="n">task_repo</span><span class="o">.</span><span class="n">bulk_archive</span><span class="p">(</span><span class="n">ids</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="p">{</span><span class="s2">&quot;deleted&quot;</span><span class="p">:</span> <span class="n">count</span><span class="p">}</span>
</code></pre></div>
<blockquote>
<p><strong>Note:</strong> lifespan wiring omitted — copy from <a href="../01_basic_crud/">use case 01</a>.</p>
</blockquote>
<hr />
<h2 id="tips">💡 Tips</h2>
<ul>
<li>Bulk methods <strong>bypass</strong> the caching and population layers. If you need cache consistency after a bulk write, call <code>invalidate_cache(id)</code> for each affected document, or reinitialize the cache (see <a href="../11_cache_lifecycle/">use case 11</a>).</li>
<li>Use <code>ordered=False</code> for upserts so one bad record doesn't block the rest. Catch <code>BulkWriteError</code> and surface the per-operation errors.</li>
<li>For very large batches (10k+), chunk the operation into pages of 1 000 to avoid exceeding MongoDB's 16 MB <code>bulkWrite</code> payload limit.</li>
<li><code>update_many</code> / <code>delete_many</code> require a <code>{"_id": {"$in": [...]}}</code> filter to scope the operation — never pass an unscoped filter.</li>
</ul>
<hr />
<h2 id="related">Related</h2>
<ul>
<li><a href="../02_custom_repo/">02 Custom repository</a> · <a href="../18_aggregation_pipelines/">18 Aggregation pipelines</a> · <a href="../03_transactions/">03 Transactions</a> · <a href="../11_cache_lifecycle/">11 Cache lifecycle</a></li>
</ul>
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