Symfony2.3 在控制器中获取 EntityManager 的更好方法 [英] Symfony2.3 Better way to get EntityManager inside a Controller

问题描述

我正在使用 Symfony2.3 并且我目前正在使用 EntityManager，如 __construct()

I'm using Symfony2.3 and I currently using EntityManager as shown inside __construct()

使用 __construct() 中的 EntityManager 或在每个方法中使用哪个更好?如public indexAction()

Which its a better aproach using EntityManager from __construct() or using inside each method ? as shown in public indexAction()

/**
 * QuazBar controller.
 *
 */
class QuazBarController extends Controller
{

    public function __construct()
    {
        $this->em = $GLOBALS['kernel']->getContainer()->get('doctrine')->getManager();
    }

    /**
     * Lists all QuazBar entities.
     *
     */
    public function indexAction(Request $request)
    {
        $session    = $request->getSession();
        $pagina     = $request->query->get('page', 1);
        $em         = $this->getDoctrine()->getManager();
    }

推荐答案

如果你必须在你的构造函数中使用 EntityManager，一个获得它的好方法是注入它给构造函数.

If you must have the EntityManager available in your constructor, a good way to get it is injecting it to the constructor.

为此，您必须将您的控制器定义为服务.

# src/Acme/DemoBundle/Resources/config/services.yml
parameters:
    # ...
    acme.controller.quazbar.class: Acme\DemoBundle\Controller\QuazBarController

services:
    acme.quazbar.controller:
        class: "%acme.controller.quazbar.class%"
    # inject doctrine to the constructor as an argument
    arguments: [ @doctrine.orm.entity_manager ] 

现在你要做的就是修改你的控制器:

Now all you have to do is modify your controller:

use Doctrine\ORM\EntityManager;

/**
 * QuazBar controller.
 *
 */
class QuazBarController extends Controller
{

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }
    // ...
}

如果您在构造函数中不需要 Entity Manager，您可以简单地从控制器中的任何方法中使用依赖注入容器来获取它:

If you do not require the Entity Manager in the constructor, you can simply get it using the Dependency Injection Container from any method in your controller:

$this->getDoctrine()->getManager();

或

$this->container->get('doctrine')->getManager();

控制器/setter 注入是一个不错的选择，因为您没有将控制器实现耦合到 DI 容器.

最终使用哪一种取决于您的需要.

At the end which one you use is up to your needs.

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