ember.js app

app.js

App = Ember.Application.create();

App.Router.map(function() {
  this.resource("questions", { path: '/'}, function () {
    this.resource("question", { path: ':question_id'})
  });
  this.resource("result")
});

App.QuestionsRoute = Ember.Route.extend({
  setupController: function (controller, values) {
    controller.set('model', App.Question.find());
  }
});

App.ResultRoute = Ember.Route.extend({
  setupController: function(controller, song) {
    controller.set('model', result);
  }
})

App.QuestionsController = Ember.ArrayController.extend({});

App.ApplicationController = Ember.ObjectController.extend({
  calculatedResult: function () {
    // How to get values from all Answers where isSelected is true?
  }.property('calculatedResult')
})

App.Store = DS.Store.extend({
  revision: 13,
  adapter: DS.FixtureAdapter.create()
});

App.Answer = DS.Model.extend({
  text: DS.attr('string'),
  value: DS.attr('integer'),
  isSelected: DS.attr('boolean')
})

App.Question = DS.Model.extend({
  number: DS.attr('integer'),
  text: DS.attr('string'),
  answers: DS.hasMany('App.Answer')
});

// FIXTURES

App.Answer.FIXTURES = [
  { id: 1, text: 'test', value: 1},
  { id: 2, text: 'some text', value: 0},
  { id: 3, text: 'almost true', value: 7},
  { id: 7, text: 'some critics', value: 3},
  { id: 10, text: 'Kate and Leopold', value: 10, isSelected: true }
]

App.Question.FIXTURES = [
  { id: 1, number: 1, text: 'To be or not to be?', answers: [1, 2]},
  { id: 2, number: 2, text: 'Who is on duty today?', answers: [3, 7, 10]}
];

  calculatedResult: function () {
    var summ = 0;
    var ans = App.Answer.find();

    ans.filterProperty('isSelected', true).forEach(function(item) {
      summ = summ + item.get('value');
    });

    return summ;
  }.property('calculatedResult')

but it render 0 :/