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<a href="https://github.com/d3vyce/fastapi-toolsets/raw/master/docs/reference/dependencies.md" title="View source of this page" class="md-content__button md-icon">
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<h1 id="dependencies"><code>dependencies</code><a class="headerlink" href="#dependencies" title="Permanent link">&para;</a></h1>
<p>Here's the reference for the FastAPI dependency factory functions.</p>
<p>You can import them directly from <code>fastapi_toolsets.dependencies</code>:</p>
<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.dependencies</span><span class="w"> </span><span class="kn">import</span> <span class="n">PathDependency</span><span class="p">,</span> <span class="n">BodyDependency</span>
</span></code></pre></div>
<div class="doc doc-object doc-function">
<h2 id="fastapi_toolsets.dependencies.PathDependency" class="doc doc-heading">
<code class="highlight language-python"><span class="n">fastapi_toolsets</span><span class="o">.</span><span class="n">dependencies</span><span class="o">.</span><span class="n">PathDependency</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">field</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">session_dep</span><span class="p">,</span> <span class="n">param_name</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span></code>
<a href="#fastapi_toolsets.dependencies.PathDependency" class="headerlink" title="Permanent link">&para;</a></h2>
<div class="doc doc-contents first">
<p>Create a dependency that fetches a DB object from a path parameter.</p>
<p><span class="doc-section-title">Parameters:</span></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
<th>Default</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code>model</code>
</td>
<td>
<code><a class="autorefs autorefs-external" href="https://docs.python.org/3/library/functions.html#type">type</a>[<span title="fastapi_toolsets.types.ModelType">ModelType</span>]</code>
</td>
<td>
<div class="doc-md-description">
<p>SQLAlchemy model class</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>field</code>
</td>
<td>
<code><a class="autorefs autorefs-external" title="typing.Any" href="https://docs.python.org/3/library/typing.html#typing.Any">Any</a></code>
</td>
<td>
<div class="doc-md-description">
<p>Model field to filter by (e.g., User.id)</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>session_dep</code>
</td>
<td>
<code><span title="fastapi_toolsets.types.SessionDependency">SessionDependency</span></code>
</td>
<td>
<div class="doc-md-description">
<p>Session dependency function (e.g., get_db)</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>param_name</code>
</td>
<td>
<code><a class="autorefs autorefs-external" href="https://docs.python.org/3/library/stdtypes.html#str">str</a> | None</code>
</td>
<td>
<div class="doc-md-description">
<p>Path parameter name (defaults to model_field, e.g., user_id)</p>
</div>
</td>
<td>
<code>None</code>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Returns:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><span title="fastapi_toolsets.types.ModelType">ModelType</span></code>
</td>
<td>
<div class="doc-md-description">
<p>A Depends() instance that resolves to the model instance</p>
</div>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Raises:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><span title="NotFoundError">NotFoundError</span></code>
</td>
<td>
<div class="doc-md-description">
<p>If no matching record is found</p>
</div>
</td>
</tr>
</tbody>
</table>
<details class="example" open>
<summary>Example</summary>
<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="n">UserDep</span> <span class="o">=</span> <span class="n">PathDependency</span><span class="p">(</span><span class="n">User</span><span class="p">,</span> <span class="n">User</span><span class="o">.</span><span class="n">id</span><span class="p">,</span> <span class="n">session_dep</span><span class="o">=</span><span class="n">get_db</span><span class="p">)</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="nd">@router</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/user/</span><span class="si">{id}</span><span class="s2">&quot;</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 class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get</span><span class="p">(</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> <span class="n">user</span><span class="p">:</span> <span class="n">User</span> <span class="o">=</span> <span class="n">UserDep</span><span class="p">,</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">):</span> <span class="o">...</span>
</span></code></pre></div>
</details>
</div>
</div>
<div class="doc doc-object doc-function">
<h2 id="fastapi_toolsets.dependencies.BodyDependency" class="doc doc-heading">
<code class="highlight language-python"><span class="n">fastapi_toolsets</span><span class="o">.</span><span class="n">dependencies</span><span class="o">.</span><span class="n">BodyDependency</span><span class="p">(</span><span class="n">model</span><span class="p">,</span> <span class="n">field</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">session_dep</span><span class="p">,</span> <span class="n">body_field</span><span class="p">)</span></code>
<a href="#fastapi_toolsets.dependencies.BodyDependency" class="headerlink" title="Permanent link">&para;</a></h2>
<div class="doc doc-contents first">
<p>Create a dependency that fetches a DB object from a body field.</p>
<p><span class="doc-section-title">Parameters:</span></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
<th>Default</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code>model</code>
</td>
<td>
<code><a class="autorefs autorefs-external" href="https://docs.python.org/3/library/functions.html#type">type</a>[<span title="fastapi_toolsets.types.ModelType">ModelType</span>]</code>
</td>
<td>
<div class="doc-md-description">
<p>SQLAlchemy model class</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>field</code>
</td>
<td>
<code><a class="autorefs autorefs-external" title="typing.Any" href="https://docs.python.org/3/library/typing.html#typing.Any">Any</a></code>
</td>
<td>
<div class="doc-md-description">
<p>Model field to filter by (e.g., User.id)</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>session_dep</code>
</td>
<td>
<code><span title="fastapi_toolsets.types.SessionDependency">SessionDependency</span></code>
</td>
<td>
<div class="doc-md-description">
<p>Session dependency function (e.g., get_db)</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code>body_field</code>
</td>
<td>
<code><a class="autorefs autorefs-external" href="https://docs.python.org/3/library/stdtypes.html#str">str</a></code>
</td>
<td>
<div class="doc-md-description">
<p>Name of the field in the request body</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Returns:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><span title="fastapi_toolsets.types.ModelType">ModelType</span></code>
</td>
<td>
<div class="doc-md-description">
<p>A Depends() instance that resolves to the model instance</p>
</div>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Raises:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><span title="NotFoundError">NotFoundError</span></code>
</td>
<td>
<div class="doc-md-description">
<p>If no matching record is found</p>
</div>
</td>
</tr>
</tbody>
</table>
<details class="example" open>
<summary>Example</summary>
<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="n">UserDep</span> <span class="o">=</span> <span class="n">BodyDependency</span><span class="p">(</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">User</span><span class="p">,</span> <span class="n">User</span><span class="o">.</span><span class="n">ctfd_id</span><span class="p">,</span> <span class="n">session_dep</span><span class="o">=</span><span class="n">get_db</span><span class="p">,</span> <span class="n">body_field</span><span class="o">=</span><span class="s2">&quot;user_id&quot;</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><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">@router</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/assign&quot;</span><span class="p">)</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">assign</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="n">user</span><span class="p">:</span> <span class="n">User</span> <span class="o">=</span> <span class="n">UserDep</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="p">):</span> <span class="o">...</span>
</span></code></pre></div>
</details>
</div>
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