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

When using coffeescript, I like to use the one-line syntax, first getting the property values array with .mapBy('propertyName') and then using a simple coffeescript reduce:

@get('users').mapBy('tweetsUnread').reduce (a, b) -> a + b