From 16ebe2882db4411ffe9f7a28f2dd059a4d7a4568 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laura=20Kl=C3=BCnder?= <laura@codingcatgirl.de>
Date: Thu, 5 Dec 2024 17:05:13 +0100
Subject: [PATCH] another place to not get confused with many_to_many fields

---
 src/c3nav/editor/changes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/c3nav/editor/changes.py b/src/c3nav/editor/changes.py
index 7c67af47..878b6e5e 100644
--- a/src/c3nav/editor/changes.py
+++ b/src/c3nav/editor/changes.py
@@ -741,7 +741,7 @@ class ChangedObjectCollection(BaseSchema):
                             new_situation.occupied_unique_values.setdefault(
                                 new_operation.obj.model, {}
                             ).setdefault(field_name, {})[value] = new_operation.obj.id
-                        if field.is_relation:
+                        if field.is_relation and not field.many_to_many:
                             # relation field was changed? add foundobjectreference
                             new_situation.obj_references.setdefault(
                                 field.related_model._meta.model_name, {}