Add user argument to default class name method

server/users/models.py

@@ -141,7 +141,7 @@ class SchoolClass(models.Model):
 
     @classmethod
     def create_default_group_for_teacher(cls, user):
-        default_class_name = cls.generate_default_group_name()
+        default_class_name = cls.generate_default_group_name(user)
         default_class = cls.objects.create(name=default_class_name)
         SchoolClassMember.objects.create(
             user=user,