为什么symfony容器有服务重复？

Question

I want to register class App\Service\SomeService as a service.

Here is my services.yaml:

services:
    _defaults:
        autowire: false
        autoconfigure: true
        public: true
    App\:
        resource: '../src/*'
        exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']
    someservice:
        class: App\Service\SomeService

Now I run debug:container someservice:

Information for Service "someservice"
=====================================

 ---------------- ------------------------- 
  Option           Value                    
 ---------------- ------------------------- 
  Service ID       someservice              
  Class            App\Service\SomeService  
  Tags             -                        
  Public           yes                      
  Synthetic        no                       
  Lazy             no                       
  Shared           yes                      
  Abstract         no                       
  Autowired        no                       
  Autoconfigured   yes                      
 ---------------- ------------------------- 

But also, when I run debug:container App\\Service\\SomeService:

Information for Service "App\Service\SomeService"
=================================================

 ---------------- ------------------------- 
  Option           Value                    
 ---------------- ------------------------- 
  Service ID       App\Service\SomeService  
  Class            App\Service\SomeService  
  Tags             -                        
  Public           yes                      
  Synthetic        no                       
  Lazy             no                       
  Shared           yes                      
  Abstract         no                       
  Autowired        no                       
  Autoconfigured   yes                      
 ---------------- ------------------------- 

So it turns out I have another service pointing to the same class:

namespace App\Controller;

use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use App\Service\SomeService;

class DefaultController extends Controller
{
    /**
     * @Route("/")
     * @return Response
     */
    public function index()
    {
        var_dump($this->get('someservice') === $this->get(SomeService::class));
        return new Response;
    }
}

Outputs:

bool(false)

Why do I have two services registered instead of one ?

Answer 1

That's because you registered it twice in your services.yaml.

Once automatically with this line:

App\:
    resource: '../src/*'
    exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'

The other, manually:

someservice:
    class: App\Service\SomeService

Since they have different name (someservice and App\Service\SomeService), they're different for Symfony.

I suggest you to remove the second declaration and to only call the service with its fully qualified name in your controller: $this->get(SomeService::class)