Zend Framework 2自定义Validator注入EntityManager失败求助

让我帮你找出几个关键问题，这些问题导致你的依赖注入失败，$objectRepository始终为空：

1. 构造函数的选项键名大小写不匹配 #

你的工厂类里传递给验证器的是**objectRepository（驼峰命名）**，但验证器的构造函数里却尝试获取$options['object_repository']（下划线命名）——这两个键名完全不一致，所以$this->objectRepository自然会被赋值为空。

2. 验证器的服务配置位置错误 #

在Zend Framework中，自定义验证器需要注册到**validators配置节点**，而不是主service_manager的factories里。因为验证器是由ValidatorPluginManager这个独立的子服务管理器管理的，全局服务管理器不会自动处理验证器的实例化。

3. isValid方法里的错误写法 #

你在isValid方法里直接实例化Controller和FactoryInterface，这完全违背了依赖注入的设计原则，而且完全没必要——你已经通过工厂注入了objectRepository，直接用它查询实体即可，不需要重新获取EntityManager。

修正后的验证器代码 #

namespace Rentals\Validator;

use Zend\Validator\AbstractValidator;
use Doctrine\Common\Persistence\ObjectRepository;

class ExistentialQuantification extends AbstractValidator {
    const NO_ENTITY_ID = 'noEntityId';
    const ENTITY_NOT_FOUND = 'entityNotFound';
    const INVALID_ID = 'invalidId';

    protected $messageTemplates = [
        self::NO_ENTITY_ID => 'The input does not contain an entity id.',
        self::ENTITY_NOT_FOUND => 'The entity could not be found.',
        self::INVALID_ID => 'The input does not contain a valid entity id.',
    ];

    protected $objectRepository;

    public function __construct(array $options) {
        // 匹配工厂传递的驼峰键名，同时添加类型提示保证类型安全
        if (isset($options['objectRepository']) && $options['objectRepository'] instanceof ObjectRepository) {
            $this->objectRepository = $options['objectRepository'];
        }
        parent::__construct($options);
    }

    public function isValid($value) {
        if ($value === null) {
            return true;
        }

        // 增加空值判断，避免无效ID
        if (!isset($value->id) || empty($value->id)) {
            $this->error(self::NO_ENTITY_ID);
            return false;
        }

        // 直接使用注入的objectRepository查询
        $entity = $this->objectRepository->find($value->id);
        $entityClass = $this->getOption('entity_class');

        if (!$entity instanceof $entityClass) {
            $this->error(self::ENTITY_NOT_FOUND);
            return false;
        }

        return true;
    }
}

修正后的工厂代码 #

namespace Rentals\Validator;

use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\MutableCreationOptionsInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
use Zend\Stdlib\ArrayUtils;

class ExistentialQuantificationFactory implements FactoryInterface, MutableCreationOptionsInterface {
    protected $options = [];

    public function setCreationOptions(array $options) {
        $this->options = $options;
    }

    public function createService(ServiceLocatorInterface $serviceLocator) {
        // 注意：ValidatorPluginManager是子服务管理器，需要获取主服务管理器来获取EntityManager
        $mainServiceManager = $serviceLocator->getServiceLocator();

        // 设置默认的EntityManager服务名
        if (!isset($this->options['object_manager'])) {
            $this->options['object_manager'] = 'doctrine.entitymanager.orm_default';
        }

        $objectManager = $mainServiceManager->get($this->options['object_manager']);
        $objectRepository = $objectManager->getRepository($this->options['entity_class']);

        return new ExistentialQuantification(ArrayUtils::merge(
            $this->options,
            [
                'objectRepository' => $objectRepository
            ]
        ));
    }
}

修正后的模块配置 #

<?php
return [
    // 将验证器注册到validators节点下，而不是service_manager
    'validators' => [
        'factories' => [
            Rentals\Validator\ExistentialQuantification::class => Rentals\Validator\ExistentialQuantificationFactory::class,
        ],
    ],
];
?>

使用示例（表单中调用验证器） #

在表单的init方法中配置验证器时，传递实体类等选项：

$this->add([
    'name' => 'related_entity',
    'validators' => [
        [
            'name' => Rentals\Validator\ExistentialQuantification::class,
            'options' => [
                'entity_class' => Your\Namespace\Entity\YourEntity::class,
                // 可选：如果使用自定义EntityManager，指定服务名
                // 'object_manager' => 'doctrine.entitymanager.custom'
            ],
        ],
    ],
]);

内容的提问来源于stack exchange，提问作者user7867306