auto_add and auto_add_now cannot be used together in DateTimeField definition

[Moritz Pfeiffer]

When I use auto_now=True in combination with auto_now_add=True on a models.DateTimeField I get the following error:
python manage.py check:
(fields.E160) The options auto_now, auto_now_add, and default are mutually exclusive. Only one of these options may be present.

See the attached project with a simple model illustrating this issue.

[Moritz Pfeiffer]

Simple Django 1.8 project with a single model illustrating this issue

[Claude Paroz]

Yes, this was indeed enforced in #21798. The error message is right, you are not supposed to set both parameters. In your example use case, auto_now is sufficient.