Usage of IDs in files and directories for VichUploader bundle

UploadListener.php

<?php

namespace App\EventListener;

use Doctrine\Common\EventArgs;
use Doctrine\ORM\Event\LifecycleEventArgs;
use Doctrine\ORM\Event\OnFlushEventArgs;
use Vich\UploaderBundle\EventListener\Doctrine\BaseListener;

class UploadListener extends BaseListener
{

    /**
     * VichUploader is using prePersist and preUpdate events.
     * These events are executed BEFORE the id of the entity is generated.
     * Because we potentially want to use the id in the file or directory name,
     * we can't use these events.
     * The OnFlush event is thrown after the id generation in the Unit of Work.
     * This allows usage of id generators (f.ex. Symfony UUID, PostgresSQL) with
     * the exception of postInsertGenerators like MySQL autoincrement.
     * The event is also not yet in the database transaction, therefore it's safe
     * to execute a potential long running upload.
     *
     * @return array The array of events
     */
    public function getSubscribedEvents(): array
    {
        return [
            'onFlush',
        ];
    }

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

        foreach ($uow->getScheduledEntityInsertions() as $entity) {
            $event = new LifecycleEventArgs($entity, $em);
            $this->upload($event);
        }

        foreach ($uow->getScheduledEntityUpdates() as $entity) {
            $event = new LifecycleEventArgs($entity, $em);
            $this->upload($event);
        }
    }

    /**
     * @param EventArgs $event The event
     *
     * @throws \Vich\UploaderBundle\Exception\MappingNotFoundException
     */
    public function upload(EventArgs $event): void
    {
        $object = $this->adapter->getObjectFromArgs($event);

        if (!$this->isUploadable($object)) {
            return;
        }

        foreach ($this->getUploadableFields($object) as $field) {
            $this->handler->upload($object, $field);
        }

        $this->adapter->recomputeChangeSet($event);
    }

}