title: Cascade validation on entities with Symfony2
body: <p>I'm wondering how I can perform a cascade validation on an entity with the validator service.</p>
  
  <p>Using:</p>
  
  <pre><code>$validator = $this-&gt;get('validator');
  $errorList = $validator-&gt;validate($entity);
  </code></pre>
  
  <p>does not perform a validation of the "entity" children entities.</p>
  
  <p>I'm pretty sure it can be done since its possible using the form validation (using <code>'cascade_validation' =&gt; true</code>).</p>