Fix: stream signal referenced from instance

production/signals.py

@@ -46,9 +46,8 @@ def notify_stream_completed(sender, instance, **kwargs):
     """
     Notify the production team about a Production Stream being completed.
     """
-    stream = instance.stream
-    notify.send(sender=sender, recipient=stream.officer.user,
+    notify.send(sender=sender, recipient=instance.officer.user,
                 actor=sender, verb=' marked Production Stream as completed.', target=instance)
 
-    notify.send(sender=sender, recipient=stream.supervisor.user,
+    notify.send(sender=sender, recipient=instance.supervisor.user,
                 actor=sender, verb=' marked Production Stream as completed.', target=instance)

production/views.py

@@ -217,6 +217,7 @@ class DeleteEventView(DeleteView):
 
 @is_production_user()
 @permission_required('scipost.can_publish_accepted_submission', raise_exception=True)
+@transaction.atomic
 def mark_as_completed(request, stream_id):
     stream = get_object_or_404(ProductionStream.objects.ongoing(), pk=stream_id)
     stream.status = PRODUCTION_STREAM_COMPLETED