Django upgrade

users/signals.py

@@ -0,0 +1,14 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2017-2019 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+
+def add_to_default_group(sender, **kwargs):
+    """
+    When creating a new user, add it to users group
+    """
+    user = kwargs["instance"]
+    if kwargs["created"]:
+        from django.contrib.auth.models import Group
+        group, group_created = Group.objects.get_or_create(name='users')
+        user.groups.add(group)