hasMany does not load in ember data beta 14 when all the data is preloaded

I have a model with hierarchical relation like this:

 App.Question=DS.Model.extend({
  name:DS.attr('string'),
  childQuestions:DS.hasMany('question',{async:true}),
  parentQuestion:DS.attr('string')
});

My payload looks like this :

"questions":[
  {
    id:1,
    name:'question 1',
    childQuestions:[]
  },
  {
    id:2,
    name:'question 2',
    childQuestions:[3]
  },
  {
    id:3,
    name:'question 3',
    childQuestions:[],
    parentQuestion:2
  }
]

before with ember 1.5 and ember data beta 3, I was able to do :

var q = model.findBy('id','2');
console.log(q);
console.log(q.get('childQuestions'));//would give me the child questions

but the same returns empty promise array that has nothing even when it resolves!!

Here is the jsbins with ember 1.5 and data beta 3 : http://ift.tt/1BW2zVg Here is the one where things are not working for me : http://ift.tt/1BW2zVk

I could probably try out "EmbeddedRecordsMixin" but at this point we don't want to change anything in the rest api itself.

Your help will be highly appreciated. Thanks.