Neos\Media\Browser\Controller\AssetController::deleteAssetCollectionAction PHP Метод

    public function deleteAssetCollectionAction(AssetCollection $assetCollection)
    {
        if ($this->browserState->get('activeAssetCollection') === $assetCollection) {
            $this->browserState->set('activeAssetCollection', null);
        }
        $this->assetCollectionRepository->remove($assetCollection);
        $this->addFlashMessage('collectionHasBeenDeleted', '', Message::SEVERITY_OK, [htmlspecialchars($assetCollection->getTitle())]);
        $this->redirect('index');
    }

 /**
  * @param AssetCollection $assetCollection
  * @return void
  */
 public function deleteAssetCollectionAction(AssetCollection $assetCollection)
 {
     foreach ($this->siteRepository->findByAssetCollection($assetCollection) as $site) {
         $site->setAssetCollection(null);
         $this->siteRepository->update($site);
     }
     parent::deleteAssetCollectionAction($assetCollection);
 }