Symfony2: Catch Doctrine exception in the controller and set flash message

if ($form->isValid()) {
 try {
 $em = $this->getDoctrine()->getManager();
 $em->persist($entity);
 $em->flush();
 } catch(\Doctrine\DBAL\DBALException $e) {
 $this->get('session')->getFlashBag()->add('error', 'Can\'t insert entity.');
 return $this->redirect($this->generateUrl('your_route'));
 }

 return $this->redirect($this->generateUrl('your_route_show', array('id' => $entity->getId())));
}

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