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<article class="md-content__inner md-typeset">
<a href="https://github.com/d3vyce/fastapi-toolsets/raw/master/docs/module/fixtures.md" title="View source of this page" class="md-content__button md-icon">
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<h1 id="fixtures">Fixtures<a class="headerlink" href="#fixtures" title="Permanent link">&para;</a></h1>
<p>Dependency-aware database seeding with context-based loading strategies.</p>
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">&para;</a></h2>
<p>The <code>fixtures</code> module lets you define named fixtures with dependencies between them, then load them into the database in the correct order. Fixtures can be scoped to contexts (e.g. base data, testing data) so that only the relevant ones are loaded for each environment.</p>
<h2 id="defining-fixtures">Defining fixtures<a class="headerlink" href="#defining-fixtures" title="Permanent link">&para;</a></h2>
<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><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">fastapi_toolsets.fixtures</span><span class="w"> </span><span class="kn">import</span> <span class="n">FixtureRegistry</span><span class="p">,</span> <span class="n">Context</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">fixtures</span> <span class="o">=</span> <span class="n">FixtureRegistry</span><span class="p">()</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="nd">@fixtures</span><span class="o">.</span><span class="n">register</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">def</span><span class="w"> </span><span class="nf">roles</span><span class="p">():</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> <span class="k">return</span> <span class="p">[</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> <span class="n">Role</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;admin&quot;</span><span class="p">),</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> <span class="n">Role</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;user&quot;</span><span class="p">),</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> <span class="p">]</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="nd">@fixtures</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">depends_on</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;roles&quot;</span><span class="p">],</span> <span class="n">contexts</span><span class="o">=</span><span class="p">[</span><span class="n">Context</span><span class="o">.</span><span class="n">TESTING</span><span class="p">])</span>
</span><span id="__span-0-13"><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="nf">test_users</span><span class="p">():</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="k">return</span> <span class="p">[</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> <span class="n">User</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">username</span><span class="o">=</span><span class="s2">&quot;alice&quot;</span><span class="p">,</span> <span class="n">role_id</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="n">User</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">username</span><span class="o">=</span><span class="s2">&quot;bob&quot;</span><span class="p">,</span> <span class="n">role_id</span><span class="o">=</span><span class="mi">2</span><span class="p">),</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="p">]</span>
</span></code></pre></div>
<p>Dependencies declared via <code>depends_on</code> are resolved topologically — <code>roles</code> will always be loaded before <code>test_users</code>.</p>
<h2 id="loading-fixtures">Loading fixtures<a class="headerlink" href="#loading-fixtures" title="Permanent link">&para;</a></h2>
<p>By context with <a href="../../reference/fixtures/#fastapi_toolsets.fixtures.utils.load_fixtures_by_context"><code>load_fixtures_by_context</code></a>:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.fixtures</span><span class="w"> </span><span class="kn">import</span> <span class="n">load_fixtures_by_context</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="k">async</span> <span class="k">with</span> <span class="n">db_context</span><span class="p">()</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="k">await</span> <span class="n">load_fixtures_by_context</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">,</span> <span class="n">registry</span><span class="o">=</span><span class="n">fixtures</span><span class="p">,</span> <span class="n">context</span><span class="o">=</span><span class="n">Context</span><span class="o">.</span><span class="n">TESTING</span><span class="p">)</span>
</span></code></pre></div>
<p>Directly with <a href="../../reference/fixtures/#fastapi_toolsets.fixtures.utils.load_fixtures"><code>load_fixtures</code></a>:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.fixtures</span><span class="w"> </span><span class="kn">import</span> <span class="n">load_fixtures</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="k">async</span> <span class="k">with</span> <span class="n">db_context</span><span class="p">()</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a> <span class="k">await</span> <span class="n">load_fixtures</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">session</span><span class="p">,</span> <span class="n">registry</span><span class="o">=</span><span class="n">fixtures</span><span class="p">)</span>
</span></code></pre></div>
<h2 id="contexts">Contexts<a class="headerlink" href="#contexts" title="Permanent link">&para;</a></h2>
<p><a href="../../reference/fixtures/#fastapi_toolsets.fixtures.enum.Context"><code>Context</code></a> is an enum with predefined values:</p>
<table>
<thead>
<tr>
<th>Context</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>Context.BASE</code></td>
<td>Core data required in all environments</td>
</tr>
<tr>
<td><code>Context.TESTING</code></td>
<td>Data only loaded during tests</td>
</tr>
<tr>
<td><code>Context.PRODUCTION</code></td>
<td>Data only loaded in production</td>
</tr>
</tbody>
</table>
<p>A fixture with no <code>contexts</code> defined takes <code>Context.BASE</code> by default.</p>
<h2 id="load-strategies">Load strategies<a class="headerlink" href="#load-strategies" title="Permanent link">&para;</a></h2>
<p><a href="../../reference/fixtures/#fastapi_toolsets.fixtures.enum.LoadStrategy"><code>LoadStrategy</code></a> controls how the fixture loader handles rows that already exist:</p>
<table>
<thead>
<tr>
<th>Strategy</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>LoadStrategy.INSERT</code></td>
<td>Insert only, fail on duplicates</td>
</tr>
<tr>
<td><code>LoadStrategy.UPSERT</code></td>
<td>Insert or update on conflict</td>
</tr>
<tr>
<td><code>LoadStrategy.SKIP</code></td>
<td>Skip rows that already exist</td>
</tr>
</tbody>
</table>
<h2 id="merging-registries">Merging registries<a class="headerlink" href="#merging-registries" title="Permanent link">&para;</a></h2>
<p>Split fixtures definitions across modules and merge them:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.fixtures.dev</span><span class="w"> </span><span class="kn">import</span> <span class="n">dev_fixtures</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.fixtures.prod</span><span class="w"> </span><span class="kn">import</span> <span class="n">prod_fixtures</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="n">fixtures</span> <span class="o">=</span> <span class="n">fixturesRegistry</span><span class="p">()</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="n">fixtures</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">dev_fixtures</span><span class="p">)</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="n">fixtures</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">prod_fixtures</span><span class="p">)</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="c1">## Pytest integration</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="n">Use</span> <span class="p">[</span><span class="err">`</span><span class="n">register_fixtures</span><span class="err">`</span><span class="p">](</span><span class="o">../</span><span class="n">reference</span><span class="o">/</span><span class="n">pytest</span><span class="o">.</span><span class="n">md</span><span class="c1">#fastapi_toolsets.pytest.plugin.register_fixtures) to expose each fixture in your registry as an injectable pytest fixture named `fixture_{name}` by default:</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="err">```</span><span class="n">python</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="c1"># conftest.py</span>
</span><span id="__span-3-14"><a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="kn">import</span><span class="w"> </span><span class="nn">pytest</span>
</span><span id="__span-3-15"><a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.pytest</span><span class="w"> </span><span class="kn">import</span> <span class="n">create_db_session</span><span class="p">,</span> <span class="n">register_fixtures</span>
</span><span id="__span-3-16"><a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="kn">from</span><span class="w"> </span><span class="nn">app.fixtures</span><span class="w"> </span><span class="kn">import</span> <span class="n">registry</span>
</span><span id="__span-3-17"><a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a><span class="kn">from</span><span class="w"> </span><span class="nn">app.models</span><span class="w"> </span><span class="kn">import</span> <span class="n">Base</span>
</span><span id="__span-3-18"><a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a>
</span><span id="__span-3-19"><a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="n">DATABASE_URL</span> <span class="o">=</span> <span class="s2">&quot;postgresql+asyncpg://user:pass@localhost/test_db&quot;</span>
</span><span id="__span-3-20"><a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a>
</span><span id="__span-3-21"><a id="__codelineno-3-21" name="__codelineno-3-21" href="#__codelineno-3-21"></a><span class="nd">@pytest</span><span class="o">.</span><span class="n">fixture</span>
</span><span id="__span-3-22"><a id="__codelineno-3-22" name="__codelineno-3-22" href="#__codelineno-3-22"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">db_session</span><span class="p">():</span>
</span><span id="__span-3-23"><a id="__codelineno-3-23" name="__codelineno-3-23" href="#__codelineno-3-23"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">create_db_session</span><span class="p">(</span><span class="n">database_url</span><span class="o">=</span><span class="n">DATABASE_URL</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">Base</span><span class="p">,</span> <span class="n">cleanup</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-3-24"><a id="__codelineno-3-24" name="__codelineno-3-24" href="#__codelineno-3-24"></a> <span class="k">yield</span> <span class="n">session</span>
</span><span id="__span-3-25"><a id="__codelineno-3-25" name="__codelineno-3-25" href="#__codelineno-3-25"></a>
</span><span id="__span-3-26"><a id="__codelineno-3-26" name="__codelineno-3-26" href="#__codelineno-3-26"></a><span class="n">register_fixtures</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">registry</span><span class="p">,</span> <span class="n">namespace</span><span class="o">=</span><span class="nb">globals</span><span class="p">())</span>
</span></code></pre></div>
<div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="c1"># test_users.py</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">test_user_can_login</span><span class="p">(</span><span class="n">fixture_users</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="n">User</span><span class="p">],</span> <span class="n">fixture_roles</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="n">Role</span><span class="p">]):</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a> <span class="o">...</span>
</span></code></pre></div>
<p>The load order is resolved automatically from the <code>depends_on</code> declarations in your registry. Each generated fixture receives <code>db_session</code> as a dependency and returns the list of loaded model instances.</p>
<h2 id="cli-integration">CLI integration<a class="headerlink" href="#cli-integration" title="Permanent link">&para;</a></h2>
<p>Fixtures can be triggered from the CLI. See the <a href="../cli/">CLI module</a> for setup instructions.</p>
<hr />
<p><a href="../../reference/fixtures/">:material-api: API Reference</a></p>
</article>
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