public function preFlush(PreFlushEventArgs $eventArgs)
 {
     $identityMap = $eventArgs->getEntityManager()->getUnitOfWork()->getIdentityMap();
     foreach ($identityMap as $class => $entity) {
         var_dump($entity);
     }
     $entity = $eventArgs->getEntity();
     if ($this->service->getMetadata()->hasEntityMetadata($entity)) {
         $this->service->saveTaxonomies($entity);
     }
 }