title: Ember.js hasMany as list of checkboxes
body: <p>I have the following two models:</p>
  
  <pre><code>App.Child = DS.Model.extend({
      name: DS.attr('string')
  });
  </code></pre>
  
  <p>And:</p>
  
  <pre><code>App.Activity = DS.Model.extend({
      children: DS.hasMany('child',{async:true}),
      name: DS.attr('string')
  });
  </code></pre>
  
  <p>I want to use checkboxes to choose between the existing children, for the <strong>hasMany</strong> relation.</p>
  
  <p>For example, I have these three children:</p>
  
  <pre><code>App.Child.FIXTURES = [
    { id: 1, name: 'Brian' },
    { id: 2, name: 'Michael' },
    { id: 3, name: 'James' }
  ];
  </code></pre>
  
  <p>The user should be able to use checkboxes, while creating or editing an activity, for choosing which children, to add to the <strong>hasMany</strong> relation.</p>
  
  <p>I've created a JSFiddle to illustrate my question: <a href="http://jsfiddle.net/Dd6Wh/">http://jsfiddle.net/Dd6Wh/</a>. Click 'Create a new activity' to see what I'm trying to do.</p>
  
  <p>Basically it's the same as <strong>Ember.Select [ ... ] multiple="true"</strong>, but for checkboxes.</p>
  
  <p>What's the correct approach for something like this with Ember.js?</p>