title: ember.js parentController property is not set in itemController
body: <p>I have a basic requirement and I am unable to figure this out. Any help would be great.</p>
  
  <p>I have an Array of Edms (EdmsController) that contains individual Edm (EdmController). </p>
  
  <p>This is what I define:</p>
  
  <pre><code>window.CMS.EdmsController = Ember.ArrayController.extend
    itemController: 'edm'
  
  window.CMS.EdmController = Ember.ObjectController.extend Ember.Evented,
  </code></pre>
  
  <p>In the EdmController, after adding a new EDM, I want to add it to the content in the parentController.</p>
  
  <p>But</p>
  
  <pre><code>@get('parentController') is null in the EdmController.
  </code></pre>
  
  <p>What am I missing?  Why isn't the parentController being set?</p>
  
  <p>This is how I access it.</p>
  
  <pre><code>  actions:
      new_edm: -&gt;
        console.log('save_edm called')
          options = {
            url: 'cms2/new_edm',
            type:'post',
            dataType:'json',
            beforeSubmit:beforeSubmit,
            success:(responseText,statusText,xhr,$form) =&gt;
              window.bootstrap_alert.warning('EDM successfully saved')
              object = responseText
              console.log(this)
              parentController = @get('parentController')
              console.log(parentController)
              content = parentController.get('content')
              content.pushObject(object)
            error:error}
            console.log(options)
            $('#edm_form').ajaxSubmit(options)
  </code></pre>