1 files changed, 14 insertions, 0 deletions
diff --git a/archaeological_operations/models.py b/archaeological_operations/models.py
index 3fe658508..2c018ce20 100644
--- a/archaeological_operations/models.py
+++ b/archaeological_operations/models.py
@@ -2069,6 +2069,20 @@ def operation_post_save(sender, **kwargs):
 post_save.connect(operation_post_save, sender=Operation)
 
 
+def operation_town_m2m_changed(sender, **kwargs):
+    operation = kwargs.get("instance", None)
+    if not operation:
+        return
+    operation._prevent_loop = False
+    operation.regenerate_all_ids()
+    cached_label_changed(sender, **kwargs)
+
+
+m2m_changed.connect(
+    operation_town_m2m_changed, sender=Operation.towns.through
+)
+
+
 class RelationType(GeneralRelationType):
     class Meta:
         verbose_name = _("Operation relation type")