Question

I need to make entities to change status except being deleted. For those I added a listener for on flush method. So, I can see all the entities, that being deleted, but cannot prevent them to be deleted. Is it possible?

Answer 1

Throwing a Exception in the event handler cut the transaction and rollback the changes.

public function onFlush(OnFlushEventArgs $eventArgs)
{
    $em = $eventArgs->getEntityManager();
    $uow = $em->getUnitOfWork();

    foreach ($uow->getScheduledCollectionDeletions() AS $col) {
         throw new Exception('avoid delete');
    }
}