title: Django rest framework nested viewsets and routes
body: <p>Can I nest the viewsets and create routes that takes <code>pk</code> as parameters of the url?</p>
  <p>basically:</p>
  <pre class="lang-py prettyprint-override"><code>class TaskView(viewsets.ModelViewSet):
      model = Task
  </code></pre>
  <p>This works fine and it's mapped to the <code>task/</code> url, so <code>task/1/</code> gives the data of the task with id 1. now, i want to create an <code>instance</code> of the task, having CRUD operations as for the task, so i <em>would like to have</em></p>
  <pre><code>class InstanceView(viewsets.ModelViewSet):
          model = Instance
  </code></pre>
  <p>mapped to <code>task/{pk}/instance</code>, where <code>pk</code> is the id of the task.</p>
  <p>how can i do that? is it possible?
  PS: i saw that there are <code>@action</code> and <code>@link</code> but using them i loose the power of having everything made by the framework.</p>