<?php
class CustomEntityManager
{
     /**
     * VichUploaderBundle is plugged on Doctrine's PRE_PERSIST event. Which means that we can't access the entity ID
     * to generate the folder name, by design.
     *
     * @see https://github.com/dustin10/VichUploaderBundle/issues/473#issuecomment-158808635
     *
     * As a workaround - which has its drawbacks, notably on performance as we persist the object twice -, when the
     * entity is first created AND there is a file attached to upload, we store the file on the side (so not to trigger
     * VichUploaderBundle), save the entity (to generate its ID), then trigger the upload manually (so we can use the ID
     * to generate the folder's name), and finally save the entity again (as the filename may have changed and it needs
     * to be updated in the database too).
     */
    public function saveUploadableEntity(
        HasUploadedFile $entity,
        CustomEntityRepository $repository,
        \Vich\UploaderBundle\Handler\UploadHandler $vichUploaderManager,
        bool $flush = true
    ): void {
        $propertyAccessor = new \Symfony\Component\PropertyAccess\PropertyAccessor();

        $idPropertyName = $entity->getIdPropertyName();
        $filePropertyName = $entity->getUploadedFilePropertyName();

        $fileToUpload = $propertyAccessor->getValue($entity, $filePropertyName);
        $hasFileToUploadOnCreation = (
            null === $propertyAccessor->getValue($entity, $idPropertyName) && // new object
            null !== $fileToUpload // has a file to upload
        );

        if ($hasFileToUploadOnCreation) {
            $propertyAccessor->setValue($entity, $filePropertyName, null);
        }

        $repository->save(
            $entity,
            $hasFileToUploadOnCreation
                ? true // here we need to flush if we want to have access to the generated ID
                : $flush
        );

        if ($hasFileToUploadOnCreation) {
            $propertyAccessor->setValue($entity, $filePropertyName, $fileToUpload);
            $vichUploaderManager->upload($entity, $entity->getUploadedFilePropertyName());
            $repository->save($entity, $flush);
        }
    } 
}