Erase data access objects when their parent is deleted

sync/signals.py

@@ -161,8 +161,10 @@ def detect_foreign_key_changes(sender, instance, device_id):
                         print(f"Foreign key changed in {sender.__name__}: "
                             f"{field.name} from {old_value} to {new_value}")
 
-def delete_data_access_if_necessary(model_id):
+@receiver(post_delete)
-    DataAccess.objects.filter(model_id=model_id).delete()
+def delete_data_access_if_necessary(sender, instance, **kwargs):
+    if hasattr(instance, 'id'):
+        DataAccess.objects.filter(model_id=instance.id).delete()
 
 @receiver(m2m_changed, sender=DataAccess.shared_with.through)
 def handle_shared_with_changes(sender, instance, action, pk_set, **kwargs):