title: Objectify order() requires ancestor()?
body: <p>I have an entity that contain @Parent</p>
  
  <pre><code>public class MyObject {
  
      @Id
      private             String          instID;
  
      // This has to stay String, because GAE doesn't take custom type
      @Index
      @Parent
      private             Ref&lt;Partner&gt;    ownerRef;
  
      @Index
      private             Date            createdOn;
  }
  </code></pre>
  
  <p>When I tried query for all of the latest MyObject, by running...</p>
  
  <pre><code>ofy().load()
       .type(MyObject.class)
       .order("-createdOn")
       .limit(10)
       .list();
  </code></pre>
  
  <p>I got zero record back...however, if I comment out the .order() part, I got the record returned.  I wonder if the order() requires ancestor().</p>
  
  <p>Anyone knows?</p>