Symfony version(s) affected

6.3.0+

Description

If you use #MapRequestPayload attribute on a DTO whose only field is a nested DTO, Symfony crashes on the container compilation stage.

How to reproduce

(Also see https://github.com/someniatko/symfony-50708-reproducer)

Consider a following situation:

class ParentDto
{
    public function __construct(public NestedDto $nested) {}
}

class NestedDto
{
    public function __construct(public string $value) {}
}

class Controller extends AbstractController
{
    #[Route(path: [ '/path' ], methods: 'POST')]
    public function index(#[MapRequestPayload] ParentDto $dto): Response
    {
        return $this->json($dto);
    }
}

Then execute php bin/console cache:clear for any environment.

Expected: Cache clears successfully

Actual:

In DefinitionErrorExceptionPass.php line 51:
                                                                                                                                                                
  Cannot autowire service "App\Dto\NestedDto": argument "$value" of method "__construct()" is type-hinted "string", you should configure its value explicitly.

It took me almost four hours to pinpoint the issue, because I thought maybe some of the bundles I use are the culprit, or my config is incorrect, and also because, and it's the most "funny" part, this will work fine:

class ParentDto
{
    public function __construct(public string $additionalValue, public NestedDto $nested) {}
}

class NestedDto
{
    public function __construct(public string $value) {}
}

Possible Solution

No response

Additional Context

No response