New Twiddle

controllers.application.js

import Ember from 'ember';
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  init(){
    var model = Ember.Object.create({
    	title:"My Cool Model",
      items:[
        {name:"item1",isSelected:true},
        {name:"item2",isSelected:false}
      ]
    });
    this.set('model',model);
  },
  modelNames:Ember.computed('model.items.@each.isSelected',function(){
		return this.get('model.items').filterBy('isSelected',true).map(function(item){return item.name}).join(',');    
  }),
  actions:{
    checkboxSelectionChanged:function(filter){
    	Ember.set(filter, 'isSelected', !Ember.get(filter, 'isSelected'));
    }
  }
});

templates.application.hbs

{{model.title}}
{{#each model.items as | filterItem |}}
        <div><label><input type="checkbox" checked={{filterItem.isSelected}} onchange={{action "checkboxSelectionChanged" filterItem }} /> {{filterItem.name}}</label></div>
    {{/each}}
<br>
{{modelNames}}
<br>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}