How to tell the EntityManager about an entity?

Question

symfony

Hello.
I have a Comment entity that is filled with data from an array via symfony/serializer, and this data comes from the form accordingly. Yes, there is no symfony on the project, the project is old, I am moving it to components.

The entity has an $id which is the primary key. Accordingly, when editing a comment, its setId method is called:

$serializer->denormalize($request->request->all(), Comment::class);

But EM doesn't know anything about this entity and when persist()/flush() it creates a new entity, ignoring the identifier. How to make it so that the data is filled from the serializer and at the same time the doctrine does not ignore $id?

Answer 1

https://symfony.com/doc/current/components/seriali...
This can be wrapped in some custom normalizer

use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;

class MyObjectDenormalizer implements DenormalizerInterface
{
    private ObjectNormalizer $objectNormalizer;
    private EntityManagerInterface $entityManager;

    public function __construct(ObjectNormalizer $objectNormalizer, EntityManagerInterface $entityManager)
    {
        $this->objectNormalizer = $objectNormalizer;
        $this->entityManager = $entityManager;
    }

    public function denormalize($data, string $type, string $format = null, array $context = [])
    {
        if ($id = $data['id'] ?? null) {
            $object = $this->entityManager->getRepository($type)->find($id);
            $context = [
                AbstractObjectNormalizer::OBJECT_TO_POPULATE => $object,
            ];
            unset($data['id']);
        }

        return $this->objectNormalizer->denormalize($data, $type, $format, $context);
    }

    public function supportsDenormalization($data, string $type, string $format = null)
    {
        return $this->objectNormalizer->supportsDenormalization($data, $type, $format);
    }
}

But it's better to substitute the object in the controller based on the data from the route ( /comment/{id}/edit), because it is possible to change the id and edit another entity (to which, for example, the user does not have access)