Symfony 依赖注入组件独立注入 Doctrine 实体管理器答案

【问题标题】：Symfony Dependency Injection Component Standalone Inject Doctrine Entity ManagerSymfony 依赖注入组件独立注入 Doctrine 实体管理器
【发布时间】：2014-08-23 09:00:01
【问题描述】：

我正在 Symfony 框架之外开发一个小型应用程序，我想使用 Symfony 依赖注入组件来自动解析我的存储库，这些存储库需要 \Doctrine\ORM\EntityManager 作为其构造函数中的参数。

我想将现有实例绑定到依赖注入容器 - 但我似乎无法从文档中弄清楚这一点。似乎容器正在使用反射来获取实例的类名，然后创建一个新实例。变量$entityManager 是\Doctrine\ORM\EntityManager 的一个实例。

$container = new ContainerBuilder();
$container->register('doctrine.orm.entitymanager', $entityManager);
var_dump($container->get('doctrine.orm.entitymanager'));

如果我尝试解析实例，该组件会抛出 ReflectionException。解决这个问题的正确方法是什么？

PHP Fatal error:  Uncaught exception 'ReflectionException' with message 'Access to non-public constructor of class Doctrine\ORM\EntityManager' in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:955
Stack trace:
#0 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(955): ReflectionClass->newInstanceArgs(Array)
#1 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(488): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection\Definition), 'doctrine.orm.en...')
#2 /vagrant/sfs/test.php(12): Symfony\Component\DependencyInjection\ContainerBuilder->get('doctrine.orm.en...')
#3 {main}
  thrown in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 955

Fatal error: Uncaught exception 'ReflectionException' with message 'Access to non-public constructor of class Doctrine\ORM\EntityManager' in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:955
Stack trace:
#0 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(955): ReflectionClass->newInstanceArgs(Array)
#1 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(488): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection\Definition), 'doctrine.orm.en...')
#2 /vagrant/sfs/test.php(12): Symfony\Component\DependencyInjection\ContainerBuilder->get('doctrine.orm.en...')
#3 {main}
  thrown in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 955

【问题讨论】：

标签： php symfony dependency-injection doctrine

【解决方案1】：

如果您尝试使用新命令初始化实体管理器，这将不起作用。

new EntityManager();

您必须使用 EntityManagerFactory。 https://github.com/doctrine/DoctrineORMModule/blob/master/src/DoctrineORMModule/Service/EntityManagerFactory.php

但 EntityManager 在 Symfony2 中已经注册为服务

$container->get('doctrine.orm.entity_manager');

【讨论】：