title: Backbone model urlRoot share the middle part of api
body: <p>I want to fetch an api and the format is like <code>apps/[:id]/result</code>.</p>
  
  <p>For most of the example or <a href="http://documentcloud.github.io/backbone/#Model-urlRoot" rel="nofollow">documentation</a> about setting the urlRoot is based on having the same root url.</p>
  
  <p>But my problem is the api share the same root and the end of the api name.</p>
  
  <p>I try to use below code, but it doesn't work.</p>
  
  <pre><code>var Model = Backbone.Model.extend({
      urlRoot: "/apps"
  })
  
  var model = new Model({id: 123123 + "/content"]}) //123123 just fake id 
  </code></pre>
  
  <p>Does it any way to change only the <code>middle</code> of the id?</p>
  
  <p>Or in this situation, use <code>urlRoot</code> is inappropriate?</p>