/**
* @DI\Observe("delete_ujm_exercise")
*
* @param DeleteResourceEvent $event
*/
public function onDelete(DeleteResourceEvent $event)
{
$em = $this->container->get('doctrine.orm.entity_manager');
$exercise = $event->getResource();
$nbPapers = $em->getRepository('UJMExoBundle:Paper')->countExercisePapers($event->getResource());
if (0 === $nbPapers) {
$this->container->get('ujm.exo.subscription_manager')->deleteSubscriptions($exercise);
$em->remove($exercise);
} else {
// If papers, the Exercise is not completely removed
$event->enableSoftDelete();
$em->remove($exercise->getResourceNode());
$exercise->archiveExercise();
$em->persist($exercise);
$em->flush();
}
$event->stopPropagation();
}