Fix permission check, perform_create delegation, and test mock setup

- destroy() now checks extras.delete_script (queryset is Script.objects.all())
- create() delegates to self.perform_create() instead of calling serializer.save() directly
- Add comment explaining why update/partial_update intentionally return 405
- Fix test_upload_script_module: set mock_storage.save.return_value so file_path
  receives a real string after the _save_upload return-value fix; add DB existence check

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

netbox/extras/api/views.py

@@ -306,10 +306,13 @@ class ScriptViewSet(ModelViewSet):
             context={'request': request},
         )
         serializer.is_valid(raise_exception=True)
-        serializer.save()
+        self.perform_create(serializer)
 
         return Response(serializer.data, status=status.HTTP_201_CREATED)
 
+    # PUT and PATCH are intentionally unsupported: ScriptSerializer has no writable fields
+    # and there is no implementation for replacing the underlying module file via these methods.
+    # They remain registered by ModelViewSet and return 405 rather than 404.
     def update(self, request, *args, **kwargs):
         raise MethodNotAllowed(request.method)
 
@@ -317,8 +320,8 @@ class ScriptViewSet(ModelViewSet):
         raise MethodNotAllowed(request.method)
 
     def destroy(self, request, *args, **kwargs):
-        if not request.user.has_perm('extras.delete_scriptmodule'):
+        if not request.user.has_perm('extras.delete_script'):
-            raise PermissionDenied(_("This user does not have permission to delete script modules."))
+            raise PermissionDenied(_("This user does not have permission to delete scripts."))
         return super().destroy(request, *args, **kwargs)
 
     def _get_script(self, pk):

netbox/extras/tests/test_api.py

@@ -1411,6 +1411,7 @@ class ScriptUploadTest(APITestCase):
         script_content = b"from extras.scripts import Script\nclass TestScript(Script):\n    pass\n"
         upload_file = SimpleUploadedFile('test_upload.py', script_content, content_type='text/plain')
         mock_storage = MagicMock()
+        mock_storage.save.return_value = 'test_upload.py'
         with patch('extras.api.serializers_.scripts.storages') as mock_storages:
             mock_storages.create_storage.return_value = mock_storage
             mock_storages.backends = {'scripts': {}}
@@ -1423,6 +1424,7 @@ class ScriptUploadTest(APITestCase):
         self.assertHttpStatus(response, status.HTTP_201_CREATED)
         self.assertEqual(response.data['file_path'], 'test_upload.py')
         mock_storage.save.assert_called_once()
+        self.assertTrue(ScriptModule.objects.filter(file_path='test_upload.py').exists())
 
     def test_upload_script_module_without_file_fails(self):
         self.add_permissions('extras.add_scriptmodule', 'core.add_managedfile')