✨ datings refactoring: models, migrations, sheets, admin

1 files changed, 19 insertions, 3 deletions

diff --git a/ishtar_common/models_common.py b/ishtar_common/models_common.py
index be3e06848..821a89ac4 100644
--- a/ishtar_common/models_common.py
+++ b/ishtar_common/models_common.py
@@ -1891,9 +1891,25 @@ class BaseHistorizedItem(
                 new_item.history_m2m = saved_m2m
                 values = new_item.m2m_listing(hist_key, create=True) or []
                 hist_field = getattr(self, hist_key)
-                hist_field.clear()
-                for val in values:
-                    hist_field.add(val)
+                if hasattr(hist_field, "clear"):
+                    hist_field.clear()
+                    for val in values:
+                        hist_field.add(val)
+                    continue
+                # manage related field (not real m2m)
+                # # clear removed values
+                for current_value in hist_field.all():
+                    current_values = current_value.history_compress()
+                    has_value = False
+                    # clear non existant
+                    for idx, value in enumerate(values[:]):
+                        if value.history_compress() == current_values:
+                            values.pop(idx)  # remove existing to not create them
+                            has_value = True
+                            break
+                    if has_value:
+                        continue
+                    current_value.delete()
             # force label regeneration
             self._cached_label_checked = False
             self.save()