diff --git a/functions/model_mixin.py b/functions/model_mixin.py
index 7386aa93..62c692f7 100644
--- a/functions/model_mixin.py
+++ b/functions/model_mixin.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 import copy
+from django.db.models import Q
 from django.conf import settings
 from functions.translate import fill_with_signal
 import calendar as python_calendar