title: REST and subcollections
body: <p>I have resource collection <strong>users</strong> and each user can have a filter, so another resource collection is <strong>filters</strong>.</p>
  
  <p>So, to retrieve filters we have this url</p>
  
  <pre><code>/users/:id/filters
  </code></pre>
  
  <p>How should be url to retrieve a filter by id?</p>
  
  <ul>
  <li>/users/:id/filters/:id </li>
  <li>/filters/:id</li>
  </ul>