Question

我正在为TYPO3 8构建扩展程序，也许我不太了解注入机制，但这是我的情况：

我已经编写了一个服务类来查询API。
该服务还从本地存储库获取一些信息：

class ApiService {
    protected $myRepository

    public function __construct() {
        $objectManager = GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager');
        $this->myRepository = GeneralUtility::makeInstance(MyRepository::class, $objectManager);
        var_dump($this->myRepository->persistanceManager); # outputs NULL
    }

    public function callerFunction() {
        var_dump($this->myRepository->persistenceManager); # outputs NULL
        myRepository->someRepositoryFunction();
    }
}

这会调用myRepository->someRepositoryFunction()：

class MyRepository extends \TYPO3\CMS\Extbase\Persistence\Repository {
     public function someRepositoryFunction() {
         var_dump($this->persistenceManager); # outputs a valid singleton PersistenceManager
         $data = $this->findAll(); # succeeds
     }
}

此代码在前端控制器中使用时有效。

class MyController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {
    /**
     * @var MyRepository
     * @inject
     */
    protected $myRepository = null;

    public function listAction() {
        myRepository->someRepositoryFunction();
    }
}

以某种方式，第一个var_dump输出NULL，而第二个var_dump神奇地输出有效的单例。
print_r和Repository::__construct()中的Repository::injectPersistenceManager()语句似乎没有被调用。因此，我无法解释PersistenceManager突然来自何处。

简化的堆栈跟踪：

#0 MyExtension\Domain\Repository\MyRepository->someRepositoryFunction() called at [myExtension/Classes/Service/ApiService.php]
#1 MyExtension\Service\ApiService->callerFunction() called at [myExtension/Classes/Domain/Repository/AnotherRepository.php]
#2 MyExtension\Domain\Repository\AnotherRepository->someOtherRepositoryFunction() called at [myExtension/Classes/Controller/MyController.php]
#3 MyExtension\Controller\MyController->listAction()

由于代码有效，因此不会有太大问题。但是，如果我从 Task 类调用相同的代码，则PersistenceManager 保持 NULL。

class MyTask extends AbstractTask
{

    protected $apiService = null;

    public function execute()
    {
        $this->apiService = GeneralUtility::makeInstance(ApiService::class);

        $data = $this->apiService->callerFunction();

        return true;
    }
}

再次使用简化的Stacktrace：

#0 MyExtension\Domain\Repository\MyRepository->someRepositoryFunction() called at [myExtension/Classes/Service/ApiService.php]
#1 MyExtension\Service\ApiService->callerFunction() called at [myExtension/Classes/Task/MyTask.php]
#2 MyExtension\Task\MyTask->execute() called at [typo3/sysext/scheduler/Classes/Scheduler.php]
#3 TYPO3\CMS\Scheduler\Scheduler->executeTask() called at [typo3/sysext/scheduler/Classes/Controller/SchedulerModuleController.php]

由于MyRepository的PersistenceManager为Call to a member function createQueryForType() on null，因此现在抛出NULL。

请注意，在两种情况下，ApiService都会实例化MyRepository！那么，如果我从控制器或任务中调用它，会有什么区别呢？在两种情况下都调用ApiService::__construct。（尽管此时MyRepository的实例仍然为NULL。）

为什么PersistenceManager突然出现？

Answer 1

代替：

$objectManager = GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager');
$this->myRepository = GeneralUtility::makeInstance(MyRepository::class, $objectManager);

尝试一下：

$objectManager = GeneralUtility::makeInstance('TYPO3\CMS\Extbase\Object\ObjectManager');
$this->myRepository = $objectManager->get(MyRepository::class);

objectManager解析所有依赖项注入。

Extbase：存储库中的PersistanceManager为NULL

1 个答案: