title: Naming for id column with ember-data
body: <p>I'm using ember-data with express.js on the server and a mysql backend. The problem is that my existing database structure uses a prefix for the id column:</p>
  
  <pre><code>DS.RESTAdapter.map('App.Order', {
    primaryKey: 'ord_id',
  });
  
  App.store = DS.Store.create({
    revision: 7,
    adapter: DS.RESTAdapter.create({
      bulkCommit: false
    })
  });
  
  App.Order = DS.Model.extend();
  </code></pre>
  
  <p>It seems that ember-data requires an 'id' field. Is there a way to map it to my 'ord_id'?</p>
  
  <p>EDIT: I had to define the map before using it.</p>