code: public function prePersist(LifecycleEventArgs $args)
      {
          $entity = $args->getEntity();
  
          if (!$entity instanceof Uuidentifiable) {
              return;
          }
  
          $this->idService->generateUuid($entity);
      }
docs: Generate an uuid before persisting the entity, if none provided
  
  @param \Doctrine\ORM\Event\LifecycleEventArgs $args