php - 使用自定义 Doctrine 2 hydrator 进行依赖注入(inject)

Question

我正在 Symfony 2 项目中的 Doctrine 2 中设置自定义水化器，但要使其执行所需操作，它需要另一项服务。 documentation for custom hydrators只展示了如何提供一个 hydrator 类，所以没有办法注入(inject)依赖。

例如:

$em->getConfiguration()->addCustomHydrationMode('CustomHydrator', 'MyProject\Hydrators\CustomHydrator');

我怀疑 Doctrine 正在初始化水化器本身，因此任何依赖项都需要首先通过其他一些 Doctrine 类传递。

有没有办法提供自定义的“水化工厂”或类似于允许注入(inject)额外依赖项的 Doctrine？如果没有此功能，定制保湿器似乎相当有限。

---

答案:感谢 Denis V

我的工作如下。我无法发布实际代码，所以我将一些虚拟占位符放在一起，以便您可以看到它们是如何组合在一起的。

src/Acme/ExampleBundle/resources/config/services.yml

services:
    doctrine.orm.entity_manager.abstract:
        class:          Acme\ExampleBundle\Entity\DoctrineEntityManager
        factory_class:  Acme\ExampleBundle\Entity\DoctrineEntityManager
        factory_method: create
        abstract:       true
        calls:
            - [ setMyDependency, [@acme.my_custom_service]]

src/Acme/ExampleBundle/Entity/DoctrineEntityManager.php

namespace Acme\ExampleBundle\Entity;

use Acme\ExampleBundle\Hydrator\MyHydrator;
use Doctrine\Common\EventManager;
use Doctrine\DBAL\Connection;
use Doctrine\ORM\Configuration;
use Doctrine\ORM\EntityManager as BaseEntityManager;
use Doctrine\ORM\ORMException;
use Doctrine\ORM\Query;

class DoctrineEntityManager extends BaseEntityManager
{
    protected $myDependency;

    /**
     * Note: This must be redefined as Doctrine's own entity manager has its own class name hardcoded in.
     */
    public static function create($conn, Configuration $config, EventManager $eventManager = null)
    {
        if (!$config->getMetadataDriverImpl()) {
            throw ORMException::missingMappingDriverImpl();
        }

        switch (true) {
            case (is_array($conn)):
                $conn = \Doctrine\DBAL\DriverManager::getConnection(
                    $conn, $config, ($eventManager ?: new EventManager())
                );
                break;

            case ($conn instanceof Connection):
                if ($eventManager !== null && $conn->getEventManager() !== $eventManager) {
                     throw ORMException::mismatchedEventManager();
                }
                break;

            default:
                throw new \InvalidArgumentException("Invalid argument: " . $conn);
        }

        return new self($conn, $config, $conn->getEventManager());
    }

    public function setMyDependency($myCustomService)
    {
        $this->myDependency = $myCustomService;
    }

    public function newHydrator($hydrationMode)
    {
        if ($hydrationMode == 'MyHydrationMode') {
            return new MyHydrator($this, $this->myDependency);
        }

        return parent::newHydrator($hydrationMode);
    }
}

src/Acme/ExampleBundle/Hydrator/MyHydrator.php

namespace Acme\ExampleBundle\Hydrator;

use Doctrine\ORM\EntityManager;
use Doctrine\ORM\Internal\Hydration\ObjectHydrator;

class MyHydrator extends ObjectHydrator
{
    protected $myDependency;

    public __construct(EntityManager $em, $myDependency)
    {
        parent::__construct($em);

        $this->myDependency = $myDependency;
    }

    protected function hydrateAllData()
    {
        /* hydration stuff with my dependency here */
    }
}

Answer 1

尝试在你的 config.yml 中添加这个

doctrine:
    orm:
        hydrators:
            CustomHydrator: MyProject\Hydrators\CustomHydrator

更新

由于您不能向 Hydrator 本身注入(inject)任何东西，因此您可以创建一个自定义的 EntityManager(您自己建议的)。

可以这样做:

services:  
    name_of_your_custom_manager:
        class: %doctrine.orm.entity_manager.class%
        factory_service:  doctrine
        factory_method:   getManager
        arguments: ["name_of_your_custom_manager"]
        calls:
            - [ setCustomDependency, ["@acme_bundle.custom_dependency"] ]