在EntityRepository中注入EventDispatcher的最佳方法是什么？

Question

我想知道EntityRepository类中EventDispatcher注入的最佳实践是什么.

Answer 1

首先,使用global是一种非常糟糕的做法.我强烈建议你不要这样做.
其次,将服务注入存储库似乎不是一个好主意.它往往会违反单一责任原则等法律.

我将创建一个管理器来包装存储库的方法,并将触发您需要的事件.了解如何将存储库注入服务以获取更多信息.

services.yml

services:
    my_manager:
        class: Acme\FooBundle\MyManager
        arguments:
            - @acme_foo.repository
            - @event_dispatcher

    acme_foo.repository:
        class: Acme\FooBundle\Repository\FooRepository
        factory_service: doctrine.orm.entity_manager
        factory_method: getRepository
        arguments:
            - "AcmeFooBundle:Foo"

Acme\FooBundle\MyManager

use Acme\FooBundle\Repository\FooRepository;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

class MyManager
{
    protected $repository;
    protected $dispatcher;

    public function __construct(FooRepository $repository, EventDispatcherInterface $dispatcher)
    {
        $this->repository = $repository;
        $this->dispatcher = $dispatcher;
    }

    public function findFooEntities(array $options = array())
    {
        $event = new PreFindEvent;
        $event->setOptions($options);

        $this->dispatcher->dispatch('find_foo.pre_find', $event);

        $results = $this->repository->findFooEntities($event->getOptions());

        $event = new PostFindEvent;
        $event->setResults($results);

        $this->dispatcher->dispatch('find_foo.post_find', $event);

        return $event->getResults();
    }
}

然后,您可以在控制器中使用它,就像服务一样.

$this->get('my_manager')->findFooEntities($options);

但是,如果您确实需要将事件调度程序注入实体,则可以执行此操作

services.yml

services:
    acme_foo.repository:
        class: Acme\FooBundle\Repository\FooRepository
        factory_service: doctrine.orm.entity_manager
        factory_method: getRepository
        arguments:
            - "AcmeFooBundle:Foo"
        calls:
            - [ "setEventDispatcher", [ @event_dispatcher ] ]

然后,您只需将该setEventDispatcher方法添加到您的存储库.

Acme\FooBundle\Repository\FooRepository

class FooRepository extends EntityRepository
{
    protected $dispatcher;

    public function setEventDispatcher(EventDispatcherInterface $dispatcher)
    {
        $this->dispatcher = $dispatcher;
    }

    public function findFooEntities(array $options = array())
    {
        $dispatcher = $this->dispatcher;

        // ...
    }
}

只需确保在控制器中使用它时调用服务而不是存储库.

做

$this->get('acme_foo.repository')->findFooEntities();

别

$this->getDoctrine()->getManager()->getRepository('AcmeFooBundle:Foo')->findFooEntities();