gistfile1.txt

//Model

  number: Ember.computed(function(){
    var cid = this.get('CID'),
        promise;
    promise = this.get('deal').then(function(deal){
      var num = deal.get('contentNumbering')[cid];
      return num ? num + '.' : '';
    });
    return DS.PromiseObject.create({promise: promise});
  }).property('deal.contentNumbering'),

// Template
{{item.number}}
{{item.number.content}}

// Output
<DS.PromiseObject ...>
123 (correct output)

// Desired Output
123 (correct output)
123 (correct output)