Handle existing amends on LessonEvents

aleksis/apps/untis/util/mysql/importers/absences.py

@@ -21,6 +21,7 @@ from ..util import (
     move_weekday_to_range,
     run_default_filter,
     untis_date_to_date,
+    update_or_create_lesson_event,
 )
 
 logger = logging.getLogger(__name__)
@@ -151,7 +152,7 @@ def import_absences(
 
             for affected_event in affected_events:
                 ref_object = affected_event["REFERENCE_OBJECT"]
-                amending_event, __ = LessonEvent.objects.update_or_create(
+                amending_event = update_or_create_lesson_event(
                     amends=ref_object,
                     datetime_start=affected_event["DTSTART"].dt,
                     datetime_end=affected_event["DTEND"].dt,
@@ -159,6 +160,7 @@ def import_absences(
                 )
                 amending_event.extended_data["cancelled_by_absence_untis"] = import_ref
                 amending_event.save()
+
                 logging.info(
                     f"  Cancel lesson event {ref_object.id} from {affected_event['DTSTART'].dt} "
                     f"to {affected_event['DTEND'].dt} with event {amending_event.id}"