php - Symfony2 - 使用 Controller Autowiring 服务

Question

我能够使用 Symfony2 的新 Autowiring 功能将服务注入(inject)到服务中。但是，我无法将服务注入(inject) Controller 。我没有做什么/做错了什么？

这是我的 services.yml 文件:

services:
    home_controller:
        class:  AppBundle\Controller\HomeController
        autowire:  true

这是我的 ServiceConsumerDemo:

namespace AppBundle\Services;

class ServiceConsumerDemo {

    private $serviceDemo;

    public function __construct(ServiceDemo $serviceDemo) {
        $this->serviceDemo = $serviceDemo;
    }

    public function getMessage(){
        return $this->serviceDemo->helloWorld();
    }
}

这是服务演示:

namespace AppBundle\Services;

class ServiceDemo 
{    
    public function helloWorld(){
        return "hello, world!";
    }
}

这是 HomeController(有效):

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;


class HomeController extends Controller
{
    /**
     * @Route("/")
     *
     */
    public function indexAction(Request $request)
    {
        $message[0] = $this->get('service_consumer_demo')->getMessage();
        return new \Symfony\Component\HttpFoundation\JsonResponse($message);
    }
}

这是 HomeController，它不起作用

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use AppBundle\Services\ServiceConsumerDemo;

class HomeController extends Controller
{

    private $serviceConsumerDemo;

    public function __construct(ServiceConsumerDemo $serviceConsumerDemo) {

        $this->serviceConsumerDemo = $serviceConsumerDemo;
    }

    /**
     * @Route("/", name="homepage")
     *
     */
    public function indexAction(Request $request)
    {
        $message[0] =  $this->serviceConsumerDemo->getMessage();
        return new \Symfony\Component\HttpFoundation\JsonResponse($message);
    }
}

这是抛出的错误:

Catchable Fatal Error: Argument 1 passed to AppBundle\Controller\HomeController::__construct() must be an instance of AppBundle\Services\ServiceConsumerDemo, none given,

如何访问 Controller 中的服务？我知道我需要将 Controller 声明为服务。所以我在 services.yml 文件中提到了 Controller 。还有什么我需要做的吗？

Answer 1

默认情况下， Controller 不被视为服务，因此您不能对它们使用 Autowiring 。

但是，这是一个足够简单的修复 - 在带有服务定义的类(即不在类中的操作方法)上添加一个 @Route 注释。

来自documentation :

The @Route annotation on a controller class can also be used to assign the controller class to a service so that the controller resolver will instantiate the controller by fetching it from the DI container instead of calling new PostController() itself.

例如:

/** 
 * @Route(service="app_controller") 
 */
class AppController extends Controller
{

    private $service;

    public function __construct(SomeService $service)
    {
        $this->service = $service;
    }

    /** @Route("/") */
    public function someAction()
    {
        $this->service->doSomething();
    }

}

在你的配置中:

app_controller:
    class:  AppBundle\Controller\AppController
    autowire: true