title: Ember Data, Relationships, output of attribute
body: <p>I have two entities with fixtures data: <code>User</code> and <code>Role</code>. When I load a <code>User</code>, it contains one <code>Role</code>. I would like to show the name of the role. Here is relevant code:</p>
  
  <pre><code>App.User = DS.Model.extend({
      name: DS.attr('string'),
      role: DS.belongsTo('App.Role'),
  });
  
  App.Role = DS.Model.extend({
      name: DS.attr('string'),
  });
  App.User.FIXTURES = [{
  id:1,
  name:'user',
  role:1
  }];
  App.Role.FIXTURES = [{
  id:1,
  name:'reader',
  }]
  
  App.UsersRoute = Ember.Route.extend({
   model: function() {
    return App.User.find();
   }
  });
  
   &lt;script type="text/x-handlebars" data-template-name="users"&gt;
             {{#each controller}}
                {{name}} {{role.name}}
             {{/each}}
   &lt;/script&gt;
  </code></pre>
  
  <p>the name of role is not displayed but if I change it to <code>{{role.id}}</code> the id of role is displayed</p>