Ember.js: Calculate the sum of a property of all child models

Question

My application has the following models:

App.Store = DS.Store.extend({
    revision: 11,
    adapter: \'DS.FixtureAdapter\'
});

App.List = DS.Model.extend({
            


        

Answer 1

Another option would be to use Ember.computed.sum see here

App.List = DS.Model.extend({
  name: DS.attr('string'),
  users: DS.hasMany('App.User'),

  tweetsUnread: Ember.computed.mapBy('users', 'tweetsUnread'),
  totalTweetsUnread: Ember.computed.sum('tweetsUnread')   
});