1 files changed, 7 insertions, 0 deletions
diff --git a/models.py b/models.py
index 4be7ef5..0625e34 100644
--- a/models.py
+++ b/models.py
@@ -65,6 +65,13 @@ class Timetable(SlugModel):
 
 
 class GroupManager(Manager):
+    def get_relevant_children(self, group):
+        parent_in = self.get_queryset().filter(parent=group)
+        return self.get_queryset().filter(Q(parent=group) | Q(parent__in=parent_in)) \
+                                  .annotate(children_count=Count("children")) \
+                                  .filter(children_count=0) \
+                                  .order_by("name")
+
     def get_relevant_groups(self, *args, **criteria):
         return self.get_queryset().filter(*args, **criteria) \
                                   .annotate(children_count=Count("children")) \