将DI与Symfony控制器结合使用

Question

我正在寻找一个用Symfony控制器实现DI的具体示例。。。https://symfony.com/doc/3.4/controller/service.html没有多大帮助。

配置

search_service:
class:        AcmeMyBundleServicesSearchService
search_controller:
class:        AcmeMyBundleControllerSearchController
arguments:    ['@search_service']

控制器

// Acme/MyBundle/Controllers/SearchController.php
class SearchController extends Controller
{
public function __construct(SearchService $searchService)
{
$this->searchService = $searchService;
}
}

给我：

Type error: Argument 1 passed to Acme\MyBundle\Controller\SearchController::__construct() must be an instance of Acme\MyBundle\Services\SearchService, none given

感谢任何帮助：(

Answer 1

您的控制器不工作，因为您没有命名空间。因此，在开始时，添加正确的名称空间，但使用手动连接注入参数仍然会有问题，因为您扩展了基本控制器。

最好只使用自动布线，这样你就不需要从services.yml定义依赖项，而且它可以很容易地与控制器配合使用。

以下是示例

# app/config/services.yml
services:
# default configuration for services in *this* file
_defaults:
# automatically injects dependencies in your services
autowire: true
# automatically registers your services as commands, event subscribers, etc.
autoconfigure: true
# this means you cannot fetch services directly from the container via $container->get()
# if you need to do this, you can override this setting on individual services
public: false
# makes classes in src/AppBundle available to be used as services
# this creates a service per class whose id is the fully-qualified class name
AppBundle:
resource: '../../src/AppBundle/*'
# you can exclude directories or files
# but if a service is unused, it's removed anyway
exclude: '../../src/AppBundle/{Entity,Repository}'
# controllers are imported separately to make sure they're public
# and have a tag that allows actions to type-hint services
AppBundleController:
resource: '../../src/AppBundle/Controller'
tags: ['controller.service_arguments']

ps。此外，我建议根本不要扩展基本控制器，因为这样会得到太多实际上不需要的依赖关系。最好通过接线获得树枝、服务和您需要的一切。

Answer 2

我必须进行以下更改才能使其适用于我的3.4安装：

更改资源相对路径

AcmeMyBundleController:
resource: '../../Controller'
tags: ['controller.service_arguments']

将控制器的"名称"更改为完整类名

AcmeMyBundleControllerSearchController:
class:        AcmeMyBundleControllerSearchController
arguments:    ['@search_service']