title: YII EMongoDocumentDataProvider
body: <p>My collactions-category have 3 fields-  <code>_id</code> ,<code>name</code>, <code>parent_id</code></p>
  
  <p><code>parent_id</code> is <code>_id</code> of parent</p>
  
  <p>In <code>actionIndex</code></p>
  
  <pre><code>public function actionIndex()
  {
      $dataProvider=new EMongoDocumentDataProvider('Category');
      $this-&gt;render('index',array(
          'dataProvider'=&gt;$dataProvider,
      ));
  }
  </code></pre>
  
  <p>How I can replace <code>parent_id</code> by name of parent category</p>