Doctrine 装置如何覆盖 purger 类？

From doctrine-fixture-bundle the console doctrine:fixtures:load -n命令定义如下：

https://github.com/doctrine/DoctrineFixturesBundle/blob/3.3.x/Command/LoadDataFixturesDoctrineCommand.php https://github.com/doctrine/DoctrineFixturesBundle/blob/3.3.x/Command/LoadDataFixturesDoctrineCommand.php

我想知道如何扩展净化器并使用我自己的净化器类？use Doctrine\Common\DataFixtures\Purger\ORMPurger;

例如使用这个净化器：https://gist.github.com/Ocramius/96206e3b39e96bd64bc5 https://gist.github.com/Ocramius/96206e3b39e96bd64bc5

默认清除器由默认清除器工厂创建。至少在 MySQL 上，使用默认的清除器清除复杂的关系图很麻烦（请参阅尝试重新加载装置时出现问题 https://stackoverflow.com/questions/7405356/issue-when-trying-to-reload-the-fixtures），您发现的解决方案是在删除过程中禁用外键检查。

默认情况下，解决方案分为三个部分来执行此操作，而无需在每个控制台命令上显式指定清除程序。

首先创建purger，它简单地继承了ORMPurger为了不丢失任何功能（特别是排除项）：

<?php

namespace App\Doctrine\Fixtures;

use Doctrine\Common\DataFixtures\Purger\ORMPurger;
use Doctrine\ORM\EntityManagerInterface;

class MySQLPurger extends ORMPurger
{
    /**
     * {@inheritDoc}
     */
    public function __construct(private readonly EntityManagerInterface $entityManager, array $excluded = [])
    {
        parent::__construct($this->entityManager, $excluded);
    }

    /**
     * Purges the MySQL database with temporarily disabled foreign key checks.
     *
     * {@inheritDoc}
     */
    public function purge(): void
    {
        $connection = $this->entityManager->getConnection();

        try {
            $connection->executeStatement('SET FOREIGN_KEY_CHECKS = 0');

            parent::purge();
        } finally {
            $connection->executeStatement('SET FOREIGN_KEY_CHECKS = 1');
        }
    }
}

然后创建创建净化器的工厂：

<?php

namespace App\Doctrine\Fixtures;

use Doctrine\Bundle\FixturesBundle\Purger\PurgerFactory;
use Doctrine\Common\DataFixtures\Purger\ORMPurger;
use Doctrine\Common\DataFixtures\Purger\PurgerInterface;
use Doctrine\ORM\EntityManagerInterface;

class MySQLPurgerFactory implements PurgerFactory
{
    /**
     * Adapted from {@see \Doctrine\Bundle\FixturesBundle\Purger\ORMPurgerFactory} to return a MySQL-specific {@see PurgerInterface}.
     *
     * {@inheritDoc}
     */
    public function createForEntityManager(
        ?string $emName,
        EntityManagerInterface $em,
        array $excluded = [],
        bool $purgeWithTruncate = false
    ): PurgerInterface {
        $purger = new MySQLPurger($em, $excluded);
        $purger->setPurgeMode($purgeWithTruncate ? ORMPurger::PURGE_MODE_TRUNCATE : ORMPurger::PURGE_MODE_DELETE);

        return $purger;
    }
}

最后，覆盖服务配置中的默认清除器工厂：

services:
    # Override the default purger factory with the MySQLPurgerFactory, which skips foreign key checks.
    doctrine.fixtures.purger.orm_purger_factory:
        class: App\Doctrine\Fixtures\MySQLPurgerFactory
        tags:
            - { name: doctrine.fixtures.purger_factory, alias: default }