Merge branch '29-use-select_related-in-absence-list' into 'master'

Resolve "Use select_related in absence list"

Closes #29

See merge request AlekSIS/onboarding/AlekSIS-App-Kolego!47

aleksis/apps/kolego/schema/absence.py

@@ -67,7 +67,9 @@ class AbsenceType(PermissionsTypeMixin, DjangoFilterMixin, DjangoObjectType):
 
     @classmethod
     def get_queryset(cls, queryset, info):
-        return get_objects_for_user(info.context.user, "kolego.view_absence", queryset)
+        query = get_objects_for_user(info.context.user, "kolego.view_absence", queryset)
+        query = query.select_related("person", "reason")
+        return query
 
 
 class AbsenceBatchCreateMutation(BaseBatchCreateMutation):