gistfile1.txt

App.Choice = SC.Record.extend({
  label: SC.Record.attr(String, { isRequired: YES }),
  question: SC.Record.toOne("App.Question", { isMaster: 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"),
  correctAnswers: SC.Record.toMany("App.Choice")
});

App.Quiz = SC.Record.extend({
  title: SC.Record.attr(String, { isRequired: YES }),
  questions: SC.Record.toMany("App.Question")
});

App.quizController = SC.ArrayController.create({

// do the next and previous in the state chart by getting the next object and do App.quizController.selectObject(obj) 
// (or something similar, look up the code for this..

  currentIndex: function(){
    var selection,selObj;
    selection = this.get('selection');
    if(selection){
      selObj = selection.get('firstObject');
      return this.indexOf(selObj);
    }
    else return -1;
  }.property('selection'),
  
  nextIsEnabled: function(){
    var index = this.get('currentIndex');
    if((index !== -1) && (index < this.get('length')) return true;
  }.property('selection'),

  previousIsEnabled: function(){
    //do here something similar as above but then check for 0
  }.property('selection'),

  progress: function(){
    var index = this.get('currentIndex');
    if(index !== -1) return index + "/" + this.get('length');
  }.property('selection')

});

App.currentQuestionController = SC.ObjectController.create({
  contentBinding: SC.Binding.single('App.quizController.selection')
});

App.currentChoicesController = SC.ArrayController.create({
  contentBinding: 'App.currentQuestionController.choices',

  filledAmount: function(){
    return this.getEach('isSelected').get('length');
  }.property('@each.isSelected')

});