I’m working on a project with Symfony and Api Platform and I think that I’m missing something about the serialization process.

I have an entity AccessCode with an endpoint to POST and another to GET all codes. I made an AccessCodeNormalizer to format my data. It works for the getter and my data are ok but I have an issue with the POST “Unable to generate an IRI for the item of type AccessCode”. Here is my Normalizer :

class AccessCodeNormalizer implements NormalizerInterface
{
    public function __construct(
        private EntityManagerInterface $entityManager,
        private AccessCodeUtils $accessCodeUtils,
        private ObjectNormalizer $normalizer
    ) {
    }

    public function normalize($object, string $format = null, array $context = [])
    {
        $object->setCode($this->accessCodeUtils->formatAccessCode($this->accessCodeUtils->decryptAccessCode($object->getCode(), $this->accessCodeUtils->decodeIv($object->getIv()))));

        return $this->normalizer->normalize($object, $format, $context);
    }

    public function supportsNormalization($data, string $format = null, array $context = [])
    {
        return $data instanceof AccessCode;
    }
}

And here is my endpoints :

#[ApiResource(
    operations: [
        new GetCollection(
            uriTemplate: '/operations/{operationId}/access-codes',
            uriVariables: ['operationId' => new Link(toProperty: 'operation', fromClass: Operation::class)],
            status: 200,
            normalizationContext: ['groups' => ['code:read:bo', 'lifecycle']]
        ),
        new Post(
            uriTemplate: '/operations/{operationId}/access-code',
            uriVariables: ['operationId' => new Link(toProperty: 'operation', fromClass: Operation::class)],
            input: AccessCodeDto::class,
            provider: ObjectProvider::class, // added a provider to avoid Doctrine to try to fetch something that does not exist
            processor: AccessCodeProcessor::class
        )
    ]
)]

When I dump my AccessCode id in the normalizer I have no problem and it is flush correctly in database.