Ember Data BelongTo Relationship :Duplicate record after save

I am using ember data for my application . I defined two models with belongsTo relationship

App.Queue=DS.Model.extend({
    time_added:DS.attr("string"),
    description:DS.attr("string"),
    video:DS.belongsTo("video")
    });

    App.Video=DS.Model.extend({
    video_url:DS.attr("string"),
    title:DS.attr('string'),
    duration:DS.attr('number'),
    queue:DS.belongsTo('queue')
    });

For adding a video to queue , I do

var queue=this.store.createRecord("queue",{time_added:"2014-04-26",description:"Good to have at this time"});
    this.store.find('video',44).then(function(data){
    queue.set('video',data);
    queue.save();
    });

response after save will be

{queue:{id:1,time_added:"2014-04-26",description:"Good to have at this time",video:44},
    video:[{
    id:44,
    video_url:"beauty.png",
    title:"Cool dance",
    duration:"30",
    queue:1
    }]
    }

Now it will create new record in the store . But the problem is after save when i check the queue computed property it shows “App.Queue:ember1724:null” [in belongsTo relationship] and when i click on this property it will fetch new record from the server with the same id and remaining values are undefined . Is anything wrong wth my approach ?

I think you understand my problem . Thanks in advance .