Symfony3，DI，在控制器中注入自定义存储库时出错

Question

得到以下异常：

Catchable Fatal Error: Argument 1 passed to AppBundle\Controller\AudienceController::__construct() must be an instance of AppBundle\Repository\AudienceRepository, none given, called in /home/eddy/Projects/tm/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php on line 162 and defined

意思是，我使用自定义存储库作为构造函数参数定义了我的控制器，但是存储库从未传递或未创建。我尝试调试到 ControllerResolver 但无济于事。

[services.yml]
services:
    app.audience_repository:
        class: Doctrine\ORM\EntityRepository
        factory: ["@doctrine.orm.entity_manager", getRepository]
        arguments:
            - AppBundle\Entity\Audience
    app.audience_controller:
        class: AppBundle\Controller\AudienceController
        arguments:
            - "@app.audience_repository"


[AppBundle\Controller\AudienceController.php]
    class AudienceController extends Controller
    {
        /**
         * @var AudienceRepository
         */
        private $repository;

        /**
         * @param AudienceRepository $repository
         */
        public function __construct(AudienceRepository $repository)
        {
            $this->repository = $repository;
        }

[AppBundle\Repository\AudienceRepository]
class AudienceRepository extends EntityRepository
{
    public function save(Audience $audience)
    {
        $this->getEntityManager()->persist($audience);
        $this->getEntityManager()->flush();
    }
}

[AppBundle\Entity\Audience.php]
/**
 * Audience
 *
 * @ORM\Table(name="audience")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\AudienceRepository")
 */
class Audience

我认为这是根据 http://php-and-symfony.matthiasnoback.nl/2014/05/inject-a-repository-instead-of-an-entity-manager/ 对 symfony3 的修改（参见 https://stackoverflow.com/a/20348821/30759），应该可以工作，但我不断收到此错误。

Stacktrace:
at ErrorHandler ->handleError ('4096', 'Argument 1 passed to AppBundle\Controller\AudienceController::__construct() must be an instance of AppBundle\Repository\AudienceRepository, none given, called in /home/eddy/Projects/tm/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php on line 162 and defined', '/home/eddy/Projects/tm/src/AppBundle/Controller/AudienceController.php', '23', array()) 
in src/AppBundle/Controller/AudienceController.php at line 23   + 
at AudienceController ->__construct () 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php at line 162   + 
at ControllerResolver ->instantiateController ('AppBundle\Controller\AudienceController') 
in vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php at line 81   + 
at ControllerResolver ->instantiateController ('AppBundle\Controller\AudienceController') 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php at line 150   + 
at ControllerResolver ->createController ('AppBundle\Controller\AudienceController::newAction') 
in vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Controller/ControllerResolver.php at line 73   + 
at ControllerResolver ->createController ('AppBundle\Controller\AudienceController::newAction') 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php at line 76   + 
at ControllerResolver ->getController (object(Request)) 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Controller/TraceableControllerResolver.php at line 46   + 
at TraceableControllerResolver ->getController (object(Request)) 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 127   + 
at HttpKernel ->handleRaw (object(Request), '1') 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php at line 62   + 
at HttpKernel ->handle (object(Request), '1', true) 
in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php at line 169   + 
at Kernel ->handle (object(Request)) 
in web/app_dev.php at line 30   + 
at require ('/home/eddy/Projects/tm/web/app_dev.php') 
in vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Resources/config/router_dev.php at line 40   + 

非常感谢任何帮助:)

Answer 1

在您链接到的文章（“注入存储库而不是实体管理器”）中，他写了关于“正常”服务的文章，我还认为如果适用，您应该注入存储库而不是实体管理器。 但是：在 symfony 中，控制器默认不是服务。

基本上有两种选择：

选项 1：告诉 Symfony 你的控制器是一个服务

因为这有点复杂，所以我把这个链接留在这里：How to Define Controllers as Services

在这种情况下，您不应该扩展 Controller 基类，这反过来意味着您不能使用它提供的方法。如果你无论如何都不使用它们，这没关系，你可以去。

如果不是（例如您想使用“render”方法），您还必须使用 setContainer 方法将服务容器注入到您的控制器中，并且您做了很多工作才能再次使用基本控制器。这就是为什么我会推荐使用选项 2。

选项 2：使用 Controller 类中的辅助方法（我更喜欢这个）

$audienceRepo = $this->getDoctrine()->getRepository(Audience::class);

在这种情况下，您不必将控制器定义为服务，您可以像以前一样使用它。