title: access nested json with ng-repeat doesn't work in my case
body: <p>how to access orderId with nested json like this</p>
  
  <pre><code>var user = [
  
      {
        'id',1
        'order':[
                 {'orderId':12345},
                 {'orderId':654321}
                 ]
  
      },
      {
        'id',2
        'order':[
                 {'orderId':3333},
                 {'orderId':4444}
                 ]
  
      }
      ]
  </code></pre>
  
  <p>I tried</p>
  
  <pre><code>&lt;ul ng-repeat="user in user"&gt;
  &lt;li ng-repeat="order user.order"&gt;
  {{order.orderId}}
  &lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>one extra question : can ng-repeat use for merely objects json?</p>