feat(serializer): set the object-to-populate in deserializer context as soon as data !== null

[lyrixx]

Q	A
Branch?	main
Tickets	alternative to #7123
License	MIT
Doc PR

I have a use case where I need to send a "code" (2FA code) when deleting a resource.

With this PR, I'm able to send the code along with a DELETE request:

curl --request DELETE \
  --url https://redirection-io.test/app_dev.php/api/users/424e19b0-0db9-4595-bc43-f03632b3fe65/two-factor/devices/4d9853c3-f53c-422d-80cd-6c4c4fa64650 \
  --header 'Authorization: Bearer .....'
  --header 'Content-Type: application/json' \
  --header 'accept: application/ld+json' \
  --data '{
    "code": "610432"
}'

I use a custom DTO to do so:

#[ApiResource(
    operations: [
        new Delete(
            uriTemplate: '/users/{id}/two-factor/devices/{deviceId}',
            provider: RemoveDeviceProvider::class,
            input: RemoveDeviceInput::class,
            deserialize: true, // We force since it's delete
            validate: true, // We force since it's delete
            processor: RemoveDeviceProcessor::class,
            // More properties, but not relevant here
        ),
    ]
)]
final class RemoveDevice
{
}

The input:

#[AssertTwoFactorCode(withDeviceId: true)]
final class RemoveDeviceInput
{
    #[Assert\NotBlank]
    public string $code;

    public function __construct(
        #[Ignore]
        #[Assert\NotBlank]
        public ?User $user,
        #[Ignore]
        #[Assert\NotBlank]
        public string $deviceId,
    ) {
    }
}

with a custom provider:

class RemoveDeviceProvider implements ProviderInterface
{
    public function __construct(
        private UserRepository $userRepository,
    ) {
    }

    public function provide(Operation $operation, array $uriVariables = [], array $context = []): RemoveDeviceInput
    {
        return new RemoveDeviceInput(
            user: $this->userRepository->find($uriVariables['id']),
            deviceId: $uriVariables['deviceId'],
        );
    }
}

So I want APIP to create the RemoveDeviceInput with the RemoveDeviceProvider (it's works)
But then I want it to hydrates this object from the request body (it's not, this PR fix that)