Ember Model decorator for decoupling computed properties

user_decorator.js

var UserDecorator = Ember.ObjectProxy.extend({
    fullName: function() {
        return [this.get('firstName'), this.get('lastName')].join(' ');
    }.property('firstName', 'lastName')
});

user_route.js

App.UserRoute = Ember.Route.extend({
   model: function(params) {
       return this.get('store').find('user', params.user_id).then(function(user) {
           return UserDecorator.create({
               content: user
           })
       });
   }
});

This type of controller uses the Ember.ObjectProxy (http://emberjs.com/api/classes/Ember.ObjectProxy.html) mixin, which enables a proxy (in this case, the controller) to forward all requests to the properties that it has not defined.