Symfony version(s) affected

6.3.x

Description

#[MapEntity] attribute does not resolve an entity from its interface names, even it is implemented on the entity and aliased using doctrine.orm.resolve_target_entities configuration.

Error screen says:

Controller "App\Controller::showUser" requires that you provide a value for the "$user" argument. Either the argument is nullable and no null value has been provided, no default value has been provided or there is a non-optional argument after this one.

How to reproduce

config/packages/doctrine.yaml

doctrine:
  orm:
    resolve_target_entities:
      App\Entity\UserInterface: App\Entity\User

src/Entity/UserInterface.php

interface UserInterface
{
    public function getId(): ?int;
}

src/Entity/User.php

#[ORM\Entity]
class User implements UserInterface
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column(type: 'integer')]
    public ?int $id = null;
}

src/Controller/Controller.php

class Controller
{
    #[Route('/users/{id}', methods: ['GET']]
    public function showUser(#[MapEntity] UserInterface $user): Response
    {
        return new JsonResponse($user);
    }
}

Possible Solution

Problem 1: #[MapEntity] does not accept interfaces

MapEntity checks the class existence by class_exists. For interface names, the function will return false even if it exists. We can use class_exists($class) || interface_exists($class) for resolve this.

Problem 2: EntityValueResolver uses ClassMetadataFactory::isTransient and it does not load metadata

To resolve entities aliased in resolve_target_entities, we have to load their metadata before using. ClassMetadataFactory::isTransient does not do so, then it will return true. We should explicitly load metadata to resolve entities.

Additional Context

Specifying the actual entity as #[MapEntity(class: User::class)] do a trick, but we actually separate the interface and the entity in different repository (integrated using Symfony Bundle system).