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<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/handlebars.js/1.0.0/handlebars.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/ember.js/1.6.1/ember.js"></script>
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.0.0-beta.8/ember-data.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <h3>Boxes 'o Widgets</h3>
  <script type="text/x-handlebars">
    <div>
      <p>
        Links: 
        {{#link-to 'widgets'}}Widgets{{/link-to}}
        {{#link-to 'boxes'}}Boxes{{/link-to}}
      </p>
      {{outlet}}
    </div>
  </script>
  <script type="text/x-handlebars" data-template-name="widgets">
  <h4>Widgets</h4>
  <ul>
    {{#each}}
      <li>{{name}} Clicked: {{hasBeenClicked}} <button {{action 'toggleClick'}}>Toggle</button></li>
    {{/each}}
    </ul>
  </script>
  <script type="text/x-handlebars" data-template-name="boxes">
  <h4>Boxes</h4>
  <ul>
  {{#each}}
    <p>There are {{widgets.length}} widgets in the {{name}}, and {{clickedWidgets}} of them have been clicked.</p>
  {{/each}}
  </ul>
  </script>
</body>
</html>
 
window.App = Ember.Application.create();
App.Router.map(function() {
  this.resource('widgets', { path: '/widgets'});
  this.resource('boxes', { path: '/boxes'});
});
​
// Models
App.Box = DS.Model.extend({
  name: DS.attr('string'),
  widgets: DS.hasMany('widget', { async: true })
})
App.Widget = DS.Model.extend({
  name: DS.attr('string'),
  box: DS.belongsTo('box')
});
​
// Fixture data
App.Box.FIXTURES = [
  {id: 1, name: "Large Box", widgets: [1,2,3]},
  {id: 4, name: "Small Box", widgets: [4]}
];
App.Widget.FIXTURES = [
  {id: 1, box: 1, name: "Widget 1"},
  {id: 2, box: 1, name: "Widget 2"},
  {id: 3, box: 1, name: "Widget 3"},
  {id: 4, box: 4, name: "Widget 4"}            
];
App.ApplicationAdapter = DS.FixtureAdapter.extend();
​
// Widgets
App.WidgetsRoute = Ember.Route.extend({
  model: function() {
    return this.store.find('widget');
  }
});
App.WidgetsController = Ember.ArrayController.extend({
  itemController: 'widget',
  clickedWidgets: Ember.computed.filterBy('@this', 'hasBeenClicked', true)
});
App.WidgetController = Ember.ObjectController.extend({
  // Each widget should remember whether or not it's been clicked.
  // 'hasBeenClicked' doesn't need to be persisted to the server, so we 
  // put it on the controller instead of the model.
  hasBeenClicked: false,
  actions: {
    toggleClick: function() {
      this.set('hasBeenClicked', !this.get('hasBeenClicked'))
    }
  }
});
​
// Boxes
App.BoxesRoute = Ember.Route.extend({
  model: function() {
    return this.store.find('box');
  }
});
App.BoxesController = Ember.ArrayController.extend({
  // [...]
  itemController: 'box'
});
App.BoxController = Ember.ObjectController.extend({
  needs: ['widgets'],
  clickedWidgets: function() {
    return this.get('controllers.widgets.clickedWidgets')
      .filterBy('box', this.get('model')).length; //filterBy widgets which box is === to our model
  }.property('controllers.widgets.clickedWidgets.[]')
});
​
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