941 lines
23 KiB
HTML
941 lines
23 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link rel="prev" href="../03_client/">
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<link rel="next" href="../../04_design/">
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<link rel="icon" href="../../assets/images/favicon.png">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.6.23">
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<title>Codegen - openapi_first</title>
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<link rel="stylesheet" href="../../assets/stylesheets/main.84d31ad4.min.css">
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<link rel="stylesheet" href="../../assets/stylesheets/palette.06af60db.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style>
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<link rel="stylesheet" href="https://unpkg.com/dracula-prism/dist/css/dracula-prism.css">
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<script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="slate" data-md-color-primary="blue-grey" data-md-color-accent="teal">
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#codegen-generate-models-routes-from-your-spec" class="md-skip">
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Skip to content
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</div>
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<div data-md-component="announce">
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</div>
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<header class="md-header" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href="../.." title="openapi_first" class="md-header__button md-logo" aria-label="openapi_first" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7 7H5a2 2 0 0 0-2 2v8h2v-4h2v4h2V9a2 2 0 0 0-2-2m0 4H5V9h2m7-2h-4v10h2v-4h2a2 2 0 0 0 2-2V9a2 2 0 0 0-2-2m0 4h-2V9h2m6 0v6h1v2h-4v-2h1V9h-1V7h4v2Z"/></svg>
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
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</label>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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openapi_first
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Codegen
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</span>
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</div>
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</div>
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</div>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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</label>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg>
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</label>
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<nav class="md-search__options" aria-label="Search">
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<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7s-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3c.79 0 1.5-.31 2.04-.81l7.12 4.15c-.05.21-.08.43-.08.66 0 1.61 1.31 2.91 2.92 2.91s2.92-1.3 2.92-2.91A2.92 2.92 0 0 0 18 16.08"/></svg>
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</a>
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
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</button>
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</nav>
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<div class="md-search__suggest" data-md-component="search-suggest"></div>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<ul class="md-tabs__list">
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<li class="md-tabs__item">
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<a href="../.." class="md-tabs__link">
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Home
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</a>
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<li class="md-tabs__item">
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<a href="../../01_overview/" class="md-tabs__link">
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Overview
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../02_components/" class="md-tabs__link">
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Components
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</a>
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</li>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="../01_quickstart/" class="md-tabs__link">
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Use Cases
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../04_design/" class="md-tabs__link">
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Design
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../05_security/" class="md-tabs__link">
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Security
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../06_error_handling/" class="md-tabs__link">
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Error Handling
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../../07_testing/" class="md-tabs__link">
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Testing
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</a>
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</li>
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</ul>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary md-nav--lifted md-nav--integrated" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href="../.." title="openapi_first" class="md-nav__button md-logo" aria-label="openapi_first" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M7 7H5a2 2 0 0 0-2 2v8h2v-4h2v4h2V9a2 2 0 0 0-2-2m0 4H5V9h2m7-2h-4v10h2v-4h2a2 2 0 0 0 2-2V9a2 2 0 0 0-2-2m0 4h-2V9h2m6 0v6h1v2h-4v-2h1V9h-1V7h4v2Z"/></svg>
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</a>
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openapi_first
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../.." class="md-nav__link">
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<span class="md-ellipsis">
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Home
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../01_overview/" class="md-nav__link">
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<span class="md-ellipsis">
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Overview
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../02_components/" class="md-nav__link">
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<span class="md-ellipsis">
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Components
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" checked>
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<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="">
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<span class="md-ellipsis">
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Use Cases
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_4">
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<span class="md-nav__icon md-icon"></span>
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Use Cases
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../01_quickstart/" class="md-nav__link">
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<span class="md-ellipsis">
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Quickstart
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../02_templates/" class="md-nav__link">
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<span class="md-ellipsis">
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Templates
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../03_client/" class="md-nav__link">
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<span class="md-ellipsis">
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Client
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||
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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Codegen
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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Codegen
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</span>
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#1-why-celebrate-codegen" class="md-nav__link">
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<span class="md-ellipsis">
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🧭 1. Why Celebrate Codegen?
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</span>
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</a>
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||
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</li>
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<li class="md-nav__item">
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<a href="#2-model-generation" class="md-nav__link">
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<span class="md-ellipsis">
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🚀 2. Model Generation
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</span>
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</a>
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<nav class="md-nav" aria-label="🚀 2. Model Generation">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#why-constructor-time-validation-still-applies" class="md-nav__link">
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Why constructor-time validation still applies
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🔁 3. Route Generation / Verification
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🧪 4. Idempotent Output
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Design
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Error Handling
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|
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|
||
<h1 id="codegen-generate-models-routes-from-your-spec">Codegen — Generate Models & Routes From Your Spec</h1>
|
||
<blockquote>
|
||
<p><strong>TL;DR</strong> — point <code>openapi-first codegen</code> at your spec and get <code>models</code> + <code>routes</code> scaffolds you can bind with one line. The codegen output is deterministic, and it's a <em>starting point</em> — not a maintained artifact.</p>
|
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</blockquote>
|
||
<hr />
|
||
<h2 id="1-why-celebrate-codegen">🧭 1. Why Celebrate Codegen?</h2>
|
||
<p>Two pain points kill OpenAPI projects:</p>
|
||
<ol>
|
||
<li><strong>The "write the spec, then write the same thing as Pydantic models" step</strong> — exactly where server/client param types drift (your route says <code>item_id: int</code>, your client sends a string…).</li>
|
||
<li><strong>Writing the docs/spec catalog by hand</strong>, once you have more than a handful of operations.</li>
|
||
</ol>
|
||
<p>Codegen collapses both. One command, one source file, same generated shapes everywhere.</p>
|
||
<hr />
|
||
<h2 id="2-model-generation">🚀 2. Model Generation</h2>
|
||
<div class="language-bash highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a>openapi-first<span class="w"> </span>codegen<span class="w"> </span>models<span class="w"> </span>--module<span class="w"> </span>my_project.models<span class="w"> </span>--input<span class="w"> </span>openapi.yaml
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>The generated model module mirrors the spec's <code>components.schemas</code> <strong>by name</strong>:</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Spec</th>
|
||
<th>Generated</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>components.schemas.User</code></td>
|
||
<td><code>class User(BaseModel)</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>components.schemas.Item</code></td>
|
||
<td><code>class Item(BaseModel)</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td>every <code>$ref</code> (schema)</td>
|
||
<td>a <code>type: ClassVar</code> alias ✓</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>required + type</code> from schema</td>
|
||
<td>Pydantic <code>Field(...)</code> / type hints ✓</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p><strong>Never hand-edit those files.</strong> If the spec changes, regenerate — just like you'd re-run <code>cargo build</code> after editing <code>Cargo.toml</code>.</p>
|
||
<h3 id="why-constructor-time-validation-still-applies">Why constructor-time validation still applies</h3>
|
||
<p>Codegen doesn't change the design: the generated models are plain Pydantic, and the <strong>client/server still validate against the spec</strong> at startup. Codegen is a <em>convenience accelerator</em> on top of the fail-fast guarantees in <a href="../../04_design/">04 – Design</a> and <a href="../../06_error_handling/">06 – Error Handling</a>.</p>
|
||
<hr />
|
||
<h2 id="3-route-generation-verification">🔁 3. Route Generation / Verification</h2>
|
||
<div class="language-bash highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span>
|
||
<span class="normal"><a href="#__codelineno-1-2">2</a></span>
|
||
<span class="normal"><a href="#__codelineno-1-3">3</a></span>
|
||
<span class="normal"><a href="#__codelineno-1-4">4</a></span>
|
||
<span class="normal"><a href="#__codelineno-1-5">5</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="c1"># dry-run verification against your routes module</span>
|
||
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a>openapi-first<span class="w"> </span>codegen<span class="w"> </span>routes<span class="w"> </span>--module<span class="w"> </span>my_routes<span class="w"> </span>--input<span class="w"> </span>openapi.yaml<span class="w"> </span>--check
|
||
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a>
|
||
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="c1"># scaffold an operation skeleton (generates the handler with a TODO)</span>
|
||
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a>openapi-first<span class="w"> </span>codegen<span class="w"> </span>routes<span class="w"> </span>--module<span class="w"> </span>my_routes<span class="w"> </span>--input<span class="w"> </span>openapi.yaml
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>Why bother? Because <code>bind_routes</code> (in <a href="../../02_components/">02 – Components</a>) needs an <code>operationId</code> → handler <strong>exactly</strong> matching the spec. Codegen guarantees you never type a handler name wrong — it wears the same <code>operationId</code> as the spec says.</p>
|
||
<blockquote>
|
||
<p><strong>Note:</strong> <code>codegen</code> is build-time tooling. It does <strong>not</strong> run at runtime, and templates (the Bake-your-stuff section of <a href="../02_templates/">02 – Templates</a>) make scaffolding a server out-of-the-box even simpler for greenfield projects.</p>
|
||
</blockquote>
|
||
<hr />
|
||
<h2 id="4-idempotent-output">🧪 4. Idempotent Output</h2>
|
||
<p>Generated output is deterministic w.r.t. the spec:
|
||
- Same spec → byte-identical files (unless you hand-edit — you won't)
|
||
- Ordering follows spec declaration order
|
||
- No timestamps, no machine names, no hidden randomness</p>
|
||
<p>That determinism is what lets you <code>git diff</code> after a spec change and see <strong>exactly</strong> what moved.</p>
|
||
<hr />
|
||
<h2 id="related">🧩 Related</h2>
|
||
<ul>
|
||
<li><a href="../../01_overview/">01 – Overview</a> · <a href="../02_templates/">02 – Templates</a> · <a href="../03_client/">03 – Client</a> · <a href="../../04_design/">04 – Design</a> · <a href="../../07_testing/">07 – Testing</a></li>
|
||
</ul>
|
||
|
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|
||
|
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