es6 and ember

1. parts-controller.js

import SortableListMixin from '../mixins/sortable-list';
import Part from '../models/part';
import Section from '../models/section';

var PartsController = Ember.ArrayController.extend(SortableListMixin, {
    init: function(){
        this._super()
        // ISSUE #1  - probably unrelated the es6 change.
        // Shouldn't the content be set automatically to an array?
        if (Ember.isNone(this.get('content'))){
            this.set('content', [])
            this.set('arrangedContent', [])
        }
    },
    sortProperties: ['position'],
    sortAscending  : true,
    
    actions: {
    
        addAbove: function(part){
            var newPart = Part.create()
            // ISSUE #2: 
            // newPart.toString() == "(subclass of Ember.Model)"
            // instead of "<app@model:part:>"
            newPart.set('section', Section.create({_parent: newPart}))
            newPart.set('_parent', this.get('content'))
            this.addModelAbove(part, newPart)
        },
      
    }
});



export default PartsController;

2. part-model.js

import Course from './course';
import Section from './section';

var Part = Ember.Model.extend({

    /*
     *
     * Attributes
     *
     */
    courseId: Ember.attr(),
    position: Ember.attr(Number),

    /*
     *
     * Relationships
     *
     */

    section: Ember.belongsTo(Section, {embedded: true, key: 'section'}),
    course: Ember.belongsTo(Course, {key: 'courseId'}),


    courseDate: function(){
        return this.get('parentModel.date')
    }.property('courseId', 'parentModel.date'),
})

export default Part;