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1244 lines
29 KiB
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Application
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Controllers
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Controllers
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Methods
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Use Services
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Routing
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Content
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Futures
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<a href="../cloud/" title="Deployment" class="md-nav__link">
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Deployment
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Concepts
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Concepts
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Vapor
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Content
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<a href="../../concepts/services/" title="Services" class="md-nav__link">
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Services
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HTTP
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Code Contributions
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Async
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Async
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<a href="../../async/getting-started/" title="Package" class="md-nav__link">
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Package
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</a>
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<li class="md-nav__item">
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<a href="../../async/futures/" title="Futures" class="md-nav__link">
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Futures
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</a>
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<li class="md-nav__item">
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<a href="../../async/streams/" title="Streams" class="md-nav__link">
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Streams
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</a>
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<li class="md-nav__item">
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<a href="../../async/eventloop/" title="EventLoop" class="md-nav__link">
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EventLoop
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<li class="md-nav__item">
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<a href="../../async/reactive/" title="Reactive Programming" class="md-nav__link">
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Reactive Programming
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<a href="https://github.com/vapor/documentation/edit/beta/3.0/docs/getting-started/controllers.md" title="Edit this page" class="md-icon md-content__icon"></a>
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<h1 id="controllers">Controllers<a class="headerlink" href="#controllers" title="Permanent link">¶</a></h1>
|
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<p>Controllers are a great way to organize your code. They are collections of methods that accept
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|
a request and return a response.</p>
|
|
<p>A good place to put your controllers is in the <a href="../structure/#controllers">Controllers</a> folder.</p>
|
|
<h2 id="methods">Methods<a class="headerlink" href="#methods" title="Permanent link">¶</a></h2>
|
|
<p>Let's take a look at an example controller.</p>
|
|
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Vapor</span>
|
|
|
|
<span class="kr">final</span> <span class="kd">class</span> <span class="nc">HelloController</span> <span class="p">{</span>
|
|
<span class="kd">func</span> <span class="nf">greet</span><span class="p">(</span><span class="kc">_</span> <span class="n">req</span><span class="p">:</span> <span class="n">Request</span><span class="p">)</span> <span class="kr">throws</span> <span class="p">-></span> <span class="nb">String</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="s">"Hello!"</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
|
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|
|
<p>Controller methods should always accept a <code>Request</code> and return something <code>ResponseRepresentable</code>.
|
|
This also includes <a href="../futures/">futures</a> whose expectations are <code>ResponseRepresentable</code> (i.e, <code>Future<String></code>).</p>
|
|
<p>To use this controller, we can simply initialize it, then pass the method to a router.</p>
|
|
<div class="codehilite"><pre><span></span><span class="kd">let</span> <span class="nv">helloController</span> <span class="p">=</span> <span class="n">HelloController</span><span class="p">()</span>
|
|
<span class="n">router</span><span class="p">.</span><span class="kr">get</span><span class="p">(</span><span class="s">"greet"</span><span class="p">,</span> <span class="n">use</span><span class="p">:</span> <span class="n">helloController</span><span class="p">.</span><span class="n">greet</span><span class="p">)</span>
|
|
</pre></div>
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<h2 id="use-services">Use Services<a class="headerlink" href="#use-services" title="Permanent link">¶</a></h2>
|
|
<p>You will probably want to access your <a href="../application/#services">application's services</a> from within your controllers.
|
|
Luckily this is easy to do. First, declare what services your controller needs in its init method. Then store them
|
|
as properties on the controller.</p>
|
|
<div class="codehilite"><pre><span></span><span class="kr">final</span> <span class="kd">class</span> <span class="nc">HelloController</span> <span class="p">{</span>
|
|
<span class="kd">let</span> <span class="nv">hasher</span><span class="p">:</span> <span class="n">BCryptHasher</span>
|
|
|
|
<span class="kd">init</span><span class="p">(</span><span class="n">hasher</span><span class="p">:</span> <span class="n">BCryptHasher</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kc">self</span><span class="p">.</span><span class="n">hasher</span> <span class="p">=</span> <span class="n">hasher</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="p">...</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
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|
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<p>Next, use the <a href="../application/">application</a> to create these services when you initialize your controller.</p>
|
|
<div class="codehilite"><pre><span></span><span class="kd">let</span> <span class="nv">helloController</span> <span class="p">=</span> <span class="k">try</span> <span class="n">HelloController</span><span class="p">(</span>
|
|
<span class="n">hasher</span><span class="p">:</span> <span class="n">app</span><span class="p">.</span><span class="n">make</span><span class="p">()</span>
|
|
<span class="p">)</span>
|
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</pre></div>
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