javascript - How to get a random value from a Fixture Data in Ember -

i'm playing sample ember app shows data stored in fixture, , tries show random data fixture.

complete demo here: http://jsbin.com/ifatot/2/edit

everything works fine, however, i'm not able random index out of ember data. i'm trying find length , grab random index believe length coming 0, though have data in there.

the function looks this:

app.thoughtscontroller = ember.arraycontroller.extend({   randommessage: function() {     var thoughts = this.get('model');     var len = thoughts.get('length');     var randomthought = (math.floor(math.random()*len));     return thoughts.objectat(randomthought);   }.property('model') }); 

you should add length property dependent on randommessage computed property. allow content have finished resolving , have length.

randommessage: function() {   var len = this.get('length');   var randomthought = (math.floor(math.random()*len));       return this.objectat(randomthought); }.property('model', 'length') 

here's updated jsbin.