gistfile1.txt

App.Choice = SC.Record.extend({
  label: SC.Record.attr(String, {
    isRequired: YES
  }),
  question: SC.Record.toOne("App.Question", {
    isMaster: NO
  }),
  isSelected: NO
});
App.Question = SC.Record.extend({
  question: SC.Record.attr(String, {
    isRequired: YES
  }),
  quiz: SC.Record.toOne("App.Quiz", {
    isMaster: NO
  }),
  choices: SC.Record.toMany("App.Choice", {
    inverse: 'question',
    isMaster: YES
  }),
  correctAnswers: SC.Record.toMany("App.Choice", {
    inverse: 'question',
    isMaster: YES
  })
});
App.Quiz = SC.Record.extend({
  title: SC.Record.attr(String, {
    isRequired: YES
  }),
  questions: SC.Record.toMany("App.Question", {
    inverse: 'quiz',
    isMaster: YES
  })
});
App.quizController = SC.ArrayController.create({
  currentIndex: null,
  currentQuestion: (function() {
    return this.get('content').objectAt(this.get('currentIndex'));
  }).property('currentIndex', 'content'),
  nextQuestion: function() {
    return this.set('currentIndex', this.get('currentIndex') + 1);
  },
  previousQuestion: function() {
    return this.set('currentIndex', this.get('currentIndex') - 1);
  },
  nextDisabled: function() {
    return this.get('currentIndex') + 1 === this.getPath('length') || !this.getPath("App.currentQuestion.isFilled");
  },
  previousDisabled: function() {
    return this.get('currentIndex') === 0;
  },
  progressString: (function() {
    return "" + (this.get('currentIndex')) + "/" + (this.getPath('length'));
  }).property('currentIndex')
});
App.currentQuestionController = SC.ObjectController.create({
  contentBinding: 'App.quizController.currentQuestion'
});
App.currentChoicesController = SC.ArrayController.create({
  contentBinding: 'App.currentQuestionController.choices',
  allFilled: (function() {
    console.log("111");
    return this.get('content').filterProperty("isSelected", true).get('length') === this.getPath('correctAnswers.length');
  }).property("@each.isSelected")
});