#35890: pre_save field in parent models are not called during update in
update_or_create
-------------------------------------+-------------------------------------
Reporter: Gagaro | Type: Bug
Status: new | Component: Database
| layer (models, ORM)
Version: dev | Severity: Normal
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
With the following models:
{{{
class Parent(models.Model):
modified_at = models.DateTimeField(auto_now=True)
class Child(Parent):
modified_at_child = models.DateTimeField(auto_now=True)
}}}
When calling `update_or_create`, the pre_save of the `modified_at` field
is not called, and the field is not updated:
{{{
# Create
>>> instance, _ = Child.objects.update_or_create(pk=1)
>>> instance.modified_at
datetime.datetime(2024, 11, 6, 14, 1, 11, 52881,
tzinfo=datetime.timezone.utc)
>>> instance.modified_at_child
datetime.datetime(2024, 11, 6, 14, 1, 11, 54363,
tzinfo=datetime.timezone.utc)
# Update
>>> instance, _ = Child.objects.update_or_create(pk=1)
>>> instance.modified_at
datetime.datetime(2024, 11, 6, 14, 1, 11, 52881,
tzinfo=datetime.timezone.utc)
>>> instance.modified_at_child
datetime.datetime(2024, 11, 6, 14, 1, 21, 517245,
tzinfo=datetime.timezone.utc)
}}}
The regression seems to have happened in
https://github.com/django/django/commit/6cc0f22a73970dd7c0d29d4d8d2ff9e1cc862b30
Using `self.model._meta.concrete_fields` instead of
`self.model._meta.local_concrete_fields` seems to solve the issue, but I
don't know the internal API well enough to understand all of the
implications.
I'm also preparing a PR with a unit test and the fix, I'll update this
ticket when it will be ready.
--
Ticket URL: <https://code.djangoproject.com/ticket/35890>
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