title: Extending ActiveResource Class
body: <p>Is it possible to extend an ActiveResource class unmarshalled from a response?</p>
  
  <p>Example of ActiveResource request:</p>
  
  <pre><code>GET http://www.exampleservice.com/products.json
  </code></pre>
  
  <p>Response</p>
  
  <pre><code>[{name:'Product X', price:14.5, features:[{name:'Soft'}, {name:'Green'}, {name:'Heavy'}]}]
  </code></pre>
  
  <p>This response would be unmarshalled to a <code>Product</code> object with an array of <code>Product::Feature</code> objects. Is it possible to add some custom method/attributes to this <code>Product::Feature</code> class?</p>