Symfony version(s) affected

6.3

Description

Hello,

I am having an issue with the #[Target] attribute when using it in services.

According to https://symfony.com/doc/current/service_container/autowiring.html#dealing-with-multiple-implementations-of-the-same-type,

when I have 2 services implementing the same interface i have 2 choices:

• create an alias from the Interface and use a default service and create a named alias for the other services

• use the Target attribute.

With the first choice, everything works fine. But with the 2nd choice, I have created a default alias from the interface, then I create another alias to the other service. When I use the alias in some service I got an error

Cannot resolve argument $client of "App\Controller\TwitterController::index()": Cannot autowire service "App\Service\TwitterClient": "#[Target('appTransformerUpper')" on argument "$transformer" of method "__construct()"

Am I doing something wrong ?

How to reproduce

1. Create an interface

interface TransformerInterface
{
    public function transform(string $input): string;
}

2. Create 2 services that implement the same interface

class UppercaseTransformer implements TransformerInterface
{
    public function transform(string $input): string
    {
        return \strtoupper($input);
    }
}

class Rot13Transformer implements TransformerInterface
{
    public function transform(string $input): string
    {
        return \str_rot13($input);
    }
}

3. Create an alias from the interface in services.yaml

App\Utils\TransformerInterface: '@App\Utils\Transformer\Rot13Transformer'

And then, create another alias to the other service (cf the doc)

app.transformer.upper: '@App\Utils\Transformer\UppercaseTransformer'

Use the Interface as a Type-hint in some service (eg. TwitterClient service) like the following

use Symfony\Component\DependencyInjection\Attribute\Target;

class TwitterClient
{
    private TransformerInterface $transformer;

    public function __construct(
        #[Target('app.transformer.upper')]
        TransformerInterface $transformer
    ) {
        $this->transformer = $transformer;
    }
 ...
}

Possible Solution

No response

Additional Context

No response