feat(checkin): prefetch related objects of ShiftRegistration

shiftregister/team/views.py

@@ -289,10 +289,12 @@ class CheckinList(LoginRequiredMixin, ListView):
     title = "Ankommende Helfer:innen"
 
     def get_queryset(self):
-        return ShiftRegistration.objects.filter(
-            shift__deleted=False,
-            state=ShiftRegistration.RegState.REGISTERED,
-        ).order_by("shift__start_at")[:30]
+        return (
+            ShiftRegistration.objects.select_related("helper", "shift")
+            .prefetch_related("shift__event__calendar")
+            .filter(shift__deleted=False, state=ShiftRegistration.RegState.REGISTERED)
+            .order_by("shift__start_at")[:30]
+        )
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)