Ember 'Toggle All' Checkbox #1

controllers.application.js

import Ember from 'ember';

export default Ember.ArrayController.extend({
  itemController: 'checkboxableItem',
  selectedItems: Ember.computed.filterBy('', 'selected', true),
  selectedCount: Ember.computed.alias('selectedItems.length'),
  
  actions: {
    removeSelected: function() {
      var selectedItems = this.get('selectedItems').toArray();
      this.removeObjects(selectedItems);
    } 
  }
});

controllers.checkboxable-item.js

import Ember from 'ember';

export default Ember.ObjectController.extend({
  selected: false
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
	model() {
    return [
      Ember.Object.create({ name: "Foo" }),
      Ember.Object.create({ name: "Bar" }),
      Ember.Object.create({ name: "Baz" })
    ];
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

templates.application.hbs

<ul>
  {{#each}}
    <li>
      {{input type="checkbox" checked=selected}}
      {{name}}
    </li>
  {{/each}}
</ul>
{{selectedCount}} selected.
<button {{action "removeSelected"}}>Remove</button>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.12.0",
    "ember-template-compiler": "1.12.0",
    "ember-testing": "1.12.0"
  }
}