带extbase的TYPO3 8：删除FileReference

Question

This seems simple enough but I seem to be too stupid to do it. I have added a field to fe_users called "cv" for uploading a pdf file. In my FrontendUser Model it looks like this:

/**
 * @var \TYPO3\CMS\Extbase\Domain\Model\FileReference
 * @cascade remove
 */
protected $cv;

Uploading a file works like a charm, I used the script from https://github.com/helhum/upload_example in parts.

The only problem is deleting such a file, or rather, removing the connection between sys_file and the user. After submitting a form and checking a checkbox, I tried to do this:

$user->setCv(null);
$user->setEdited(new \DateTime());
$this->frontendUserRepository->update($user);
$persistenceManager->persistAll();

After a page reload if I take a look at the backend, the cv File is still attached to the user (but "edited" was correctly set to the current datetime). I do not understand this, how can I set the FileReference Value to null?

Answer 1

Make sure to check your Model. FileReferences are stored in an M:N relation. So you must use the folling declaration in your Model:

/**
 * cv
 *
 * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
 * @cascade remove
 */
protected $cv = null;

with an initialization in the __constructor :

public function __construct()
{
  $this->cv = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
}

Now you have your FileReference in an ObjectStorage . To clear all FileReferences you can set cv to new \\TYPO3\\CMS\\Extbase\\Persistence\\ObjectStorage() :

$user->removeCv(new \TYPO3\CMS\Extbase\Persistence\ObjectStorage()); 
$user->setEdited(new \DateTime()); 
$this->frontendUserRepository->update($user); 
$persistenceManager->persistAll();