Use update version of get_objects

aleksis/apps/chronos/models.py

@@ -406,13 +406,13 @@ class LessonEvent(CalendarEvent):
         params: dict[str, any] | None = None,
         no_effect: bool = False,
         **kwargs,
-    ) -> Iterable:
+    ) -> QuerySet:
         """Return all objects that should be included in the calendar."""
         if no_effect:
             return super().get_objects(request, params, **kwargs)
 
         if request and not has_person(request.user):
-            return []
+            return cls.objects.none()
 
         q = Q()
 
@@ -458,13 +458,14 @@ class LessonEvent(CalendarEvent):
         elif request:
             q = q & LessonEventQuerySet.for_person_q(request.user.person)
 
-        objs = (
-            super()
-            .get_objects(request, params, additional_filter=q, **kwargs)
-            .not_instance_of(SupervisionEvent)
-            .filter(q)
-            .select_related("subject", "course")
-            .prefetch_related("groups", "teachers", "rooms", "groups__members")
+        objs = super().get_objects(
+            request,
+            params,
+            start_qs=cls.objects.not_instance_of(SupervisionEvent),
+            additional_filter=q,
+            select_related=["subject", "course"],
+            prefetch_related=["groups", "teachers", "rooms", "groups__members"],
+            **kwargs,
         )
         return objs