fix: refuse deleting a document assigned to a season task

src/Controller/Administrative/System/Document/DeleteController.php

@@ -4,8 +4,10 @@ namespace App\Controller\Administrative\System\Document;
 
 use App\Entity\Upload;
 use App\Htmx\HxRedirectResponse;
+use App\Repository\SeasonTaskDocumentRepository;
 use Doctrine\ORM\EntityManagerInterface;
 use Psr\Log\LoggerInterface;
+use Symfony\Bridge\Doctrine\Attribute\MapEntity;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -17,14 +19,32 @@ class DeleteController extends AbstractController
     public function __construct(
         private readonly EntityManagerInterface $entityManager,
         private readonly LoggerInterface $logger,
+        private readonly SeasonTaskDocumentRepository $seasonTaskDocumentRepository,
     ) {
     }
 
     #[Route('/administrative/system/document/delete/{uuid}', name: 'app_administrative_system_document_delete')]
     #[IsGranted('ROLE_ADMINISTRATIVE')]
     #[IsGranted('DELETE', subject: 'document')]
-    public function index(Upload $document, Request $request): Response
-    {
+    public function index(
+        #[MapEntity(mapping: ['uuid' => 'uuid'])]
+        Upload $document,
+        Request $request,
+    ): Response {
+        // A document handed out for a season task is referenced by a NOT NULL foreign key, so
+        // deleting it fails in the database. It has to be replaced in that mapping first.
+        $seasonTaskDocuments = $this->seasonTaskDocumentRepository->findByDocument($document);
+
+        if (0 < count($seasonTaskDocuments) && true === $request->isMethod('POST')) {
+            $this->addFlash('error', 'Das Dokument ist als Saisonteam-Dokument hinterlegt und kann nicht gelöscht werden');
+            $this->logger->info('Refuse deleting document assigned to a season task', [
+                'document_id' => $document->getId(),
+                'document_filename' => $document->getOriginalFilename(),
+            ]);
+
+            return new HxRedirectResponse($this->generateUrl('app_administrative_system_document_index'));
+        }
+
         if (true === $request->isMethod('POST')) {
             $this->entityManager->remove($document);
             $this->entityManager->flush();
@@ -40,6 +60,7 @@ class DeleteController extends AbstractController
 
         return $this->render('administrative/system/document/modal_delete.html.twig', [
             'document' => $document,
+            'seasonTaskDocuments' => $seasonTaskDocuments,
         ]);
     }
 }

src/Controller/Administrative/System/Document/IndexController.php

@@ -2,6 +2,7 @@
 
 namespace App\Controller\Administrative\System\Document;
 
+use App\Repository\SeasonTaskDocumentRepository;
 use App\Repository\UploadRepository;
 use Knp\Component\Pager\PaginatorInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -15,6 +16,7 @@ class IndexController extends AbstractController
     public function __construct(
         private readonly UploadRepository $uploadRepository,
         private readonly PaginatorInterface $paginator,
+        private readonly SeasonTaskDocumentRepository $seasonTaskDocumentRepository,
     ) {
     }
 
@@ -36,6 +38,7 @@ class IndexController extends AbstractController
 
         return $this->render('administrative/system/document/index.html.twig', [
             'pagination' => $pagination,
+            'seasonTaskDocuments' => $this->seasonTaskDocumentRepository->findGroupedByDocumentId(),
         ]);
     }
 }

src/Repository/SeasonTaskDocumentRepository.php

@@ -4,6 +4,7 @@ namespace App\Repository;
 
 use App\Config\SeasonTask;
 use App\Entity\SeasonTaskDocument;
+use App\Entity\Upload;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
 
@@ -43,4 +44,31 @@ class SeasonTaskDocumentRepository extends ServiceEntityRepository
     {
         return $this->findOneBy(['taskKey' => $task->value]);
     }
+
+    /**
+     * Every mapping that points at the document, including rows whose task key no longer
+     * resolves: those still hold the foreign key that blocks deleting the upload.
+     *
+     * @return array<int, SeasonTaskDocument>
+     */
+    public function findByDocument(Upload $document): array
+    {
+        return $this->findBy(['document' => $document]);
+    }
+
+    /**
+     * The mappings grouped by the id of the document they point at, for the document list.
+     *
+     * @return array<int, array<int, SeasonTaskDocument>>
+     */
+    public function findGroupedByDocumentId(): array
+    {
+        $grouped = [];
+
+        foreach ($this->findAll() as $seasonTaskDocument) {
+            $grouped[$seasonTaskDocument->getDocument()->getId()][] = $seasonTaskDocument;
+        }
+
+        return $grouped;
+    }
 }