Don't use auto_now_add and auto_now

django_tools/models.py

@@ -11,7 +11,11 @@
 
 from django.db import models
 from django.contrib.auth.models import User
-
+try:
+    from django.utils.timezone import now
+except ImportError:
+    from datetime import datetime
+    now = datetime.now
 
 from django_tools.middlewares import ThreadLocal
 
@@ -23,11 +27,15 @@ class UpdateInfoBaseModel(models.Model):
     Base model with update info attributes, used by many models.
     The createby and lastupdateby ForeignKey would be automaticly updated. This needs the 
     request object as the first argument in the save method.
+
+    We doesn't used auto_now_add and auto_now here, because they have the odd side effect
+    see also:
+    https://github.com/jezdez/django-dbtemplates/commit/2f27327bebe7f2e7b33e5cfb0db517f53a1b9701#commitcomment-1396126
     """
     objects = models.Manager()
 
-    createtime = models.DateTimeField(auto_now_add=True, help_text="Create time")
-    lastupdatetime = models.DateTimeField(auto_now=True, help_text="Time of the last change.")
+    createtime = models.DateTimeField(default=now, editable=False, help_text="Create time")
+    lastupdatetime = models.DateTimeField(default=now, editable=False, help_text="Time of the last change.")
 
     createby = models.ForeignKey(User, editable=False, related_name="%(class)s_createby",
         null=True, blank=True, # <- If the model used outsite a real request (e.g. unittest, db shell)
@@ -41,6 +49,7 @@ def save(self, *args, **kwargs):
         Automatic update createby and lastupdateby attributes with the request object witch must be
         the first argument.
         """
+        self.last_changed = now()
         current_user = ThreadLocal.get_current_user()
 
         if current_user and isinstance(current_user, User):