/**
  * postDeleteCallback.
  *
  * This callback takes care of deleting all translations,
  * associated with the deleted content.
  */
 public function postDeleteCallback(StorageEvent $event)
 {
     $subject = $event->getSubject();
     $query = 'DELETE FROM ' . $prefix . 'translation where content_type = ? and content_type_id = ?';
     $stmt = $this->app['db']->prepare($query);
     $stmt->bindValue(1, $event->getArgument('contenttype'));
     $stmt->bindValue(2, $subject['id']);
     $stmt->execute();
 }