protected function onSuccess(UserInterface $user, $confirmation)
 {
     $user->setUsername($user->getUsername());
     $user->setLocked(false);
     $user->setEnabled(true);
     $user->setCreatedAt(new \DateTime('now'));
     $em = $this->container->get('doctrine.odm.mongodb.document_manager');
     parent::onSuccess($user, $confirmation);
 }