我正试图使用EntityManagerDecorator扩展条令中的EntityManager，但遇到了一个问题，即通过$eventArgs将对UnitOfWork中基本EntityManager的引用传递给prePersist事件。
当创建UnitOfWork时，看起来EntityManager被传递到EntityManager::__construct中的UnitOfWork。
我想一个解决方案可能是，我可以覆盖MyEntityManagerDecorator::getUnitOfWork()中的默认UnitOfWork，比如：
public function getUnitOfWork()
{
if ($this->unitOfWork === null) {
$this->unitOfWork = new UnitOfWork($this);
}
return $this->unitOfWork;
}
然而，我注意到UnitOfWork::__construct()需要EntityManager，而不是EntityManagerInterface，所以这不起作用。
我正在寻找如何从prePersist $eventArgs->getEntityManager()而不是基础EntityManager获得MyEntityManagerDecorator。我希望在不直接继承EntityManager的情况下执行此操作。文档还说"您永远不应该尝试从EntityManager继承：继承不是EntityManager的有效扩展点。".
我不确定你需要什么样的代码样本，如果有的话，所以如果你需要更多信息，请告诉我。我可以访问MyEntityManagerDecorator，正如项目中其他地方所期望的那样（到目前为止我已经尝试过了）。我在yml中设置装饰器，如下所示：
my_multi_tenant_entity_manager:
public: false
class: MyMultiTenantBundleORMMyEntityManagerDecorator
decorates: doctrine.orm.default_entity_manager
arguments: [ "@my_multi_tenant_entity_manager.inner" ]
以下是我使用的从composer:转储的包和版本号列表
installed:
doctrine/annotations v1.2.3 Docblock Annotations Parser
doctrine/cache v1.4.0 Caching library offering...
doctrine/collections v1.2 Collections Abstraction ...
doctrine/common v2.4.2 Common Library for Doctr...
doctrine/dbal v2.5.1 Database Abstraction Layer
doctrine/doctrine-bundle v1.3.0 Symfony DoctrineBundle
doctrine/doctrine-cache-bundle v1.0.1 Symfony2 Bundle for Doct...
doctrine/doctrine-migrations-bundle dev-master 6a1bd73 Symfony DoctrineMigratio...
doctrine/inflector v1.0.1 Common String Manipulati...
doctrine/instantiator 1.0.4 A small, lightweight uti...
doctrine/lexer v1.0.1 Base library for a lexer...
doctrine/migrations dev-master 058a463 Database Schema migratio...
doctrine/orm v2.4.7 Object-Relational-Mapper...
incenteev/composer-parameter-handler v2.1.0 Composer script handling...
jdorn/sql-formatter v1.2.17 a PHP SQL highlighting l...
kriswallsmith/assetic v1.2.1 Asset Management for PHP
monolog/monolog 1.12.0 Sends your logs to files...
phpdocumentor/reflection-docblock 2.0.4
phpspec/prophecy v1.3.1 Highly opinionated mocki...
phpunit/php-code-coverage 2.0.15 Library that provides co...
phpunit/php-file-iterator 1.3.4 FilterIterator implement...
phpunit/php-text-template 1.2.0 Simple template engine.
phpunit/php-timer 1.0.5 Utility class for timing
phpunit/php-token-stream 1.4.0 Wrapper around PHP's tok...
phpunit/phpunit 4.5.0 The PHP Unit Testing fra...
phpunit/phpunit-mock-objects 2.3.0 Mock Object library for ...
psr/log 1.0.0 Common interface for log...
raven/raven dev-master 407d770 A PHP client for Sentry ...
sebastian/comparator 1.1.1 Provides the functionali...
sebastian/diff 1.2.0 Diff implementation
sebastian/environment 1.2.1 Provides functionality t...
sebastian/exporter 1.2.0 Provides the functionali...
sebastian/global-state 1.0.0 Snapshotting of global s...
sebastian/recursion-context 1.0.0 Provides functionality t...
sebastian/version 1.0.4 Library that helps with ...
sensio/distribution-bundle v3.0.16 Base bundle for Symfony ...
sensio/framework-extra-bundle v3.0.4 This bundle provides a w...
sensio/generator-bundle v2.5.2 This bundle generates co...
sensiolabs/security-checker v2.0.1 A security checker for y...
swiftmailer/swiftmailer v5.3.1 Swiftmailer, free featur...
symfony/assetic-bundle v2.6.1 Integrates Assetic into ...
symfony/monolog-bundle v2.7.1 Symfony MonologBundle
symfony/swiftmailer-bundle v2.3.8 Symfony SwiftmailerBundle
symfony/symfony v2.6.4 The Symfony PHP framework
twig/extensions v1.2.0 Common additional featur...
twig/twig v1.18.0 Twig, the flexible, fast...
我建议装饰（而不是直接扩展）EntityManager，因为它会失去实现和继承组件之间的耦合。
为了能够区分与租户有关系的实体，从interface或mapped superclass实现/扩展这些类。
securityContext（用于演示）用于获取对租户的引用。
/**
* `EntityManagerDecorator` exists since v2.4
*/
class MultiTenantEntityManager extends EntityManagerDecorator {
private $securityContext;
public function __construct(EntityManagerInterface $entityManager, $securityContext) {
parent::__construct($entityManager);
$this->securityContext = $securityContext;
}
public function persist($entity) {
// set the tenant before persisting an entity
if ($entity instanceof MultiTenantEntity) {
$userId = $this->securityContext->getUserId();
$tenant = $this->wrapped->find($userId,...);
$entity->setTenant($tenant);
}
return $this->wrapped->persist($entity);
}
}