directly work on group ids

core/auth/mixins.py

@@ -307,6 +307,7 @@ class PermissionOrClubBoardRequiredMixin(PermissionRequiredMixin):
             return False
         if super().has_permission():
             return True
-        return self.club is not None and any(
-            g.id == self.club.board_group_id for g in self.request.user.all_groups
+        return (
+            self.club is not None
+            and self.club.board_group_id in self.request.user.all_groups
         )