#36489: OneToOneField + concurrent get_or_create results in wrong object in
field
cache
-------------------------------------+-------------------------------------
Reporter: Brian Atkinson | Owner: Jason
| Hall
Type: Bug | Status: assigned
Component: Database layer | Version: 5.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Rushabh Doshi):
Natalia, Simon and Sarah - thank you for looking at this issue and the
patch.
Jason - thanks for making the patch in the first place.
Given that the patch doesn't seem to fully solve the problem, and given
that this issue affects all OneToOneFields and causes a subtle data
corruption that could be hard to detect and diagnose, I have two
questions:
1. Is there a way to raise awareness of this issue and seek help in
fixing? We would offer to give it a shot, but this is very deep ORM code
and we don't feel like we have sufficient experience to attempt the patch.
2. In the meantime, could you advise on the work around? My current
thought is that we should use ForeignKey(unique=True) and eat the Django
check warning
https://github.com/django/django/blob/main/django/db/models/fields/related.py#L1079
This would force us to use `child_set.first()` but that's a small
ergonomic price to pay. Do you have any thoughts on this approach or a
better suggestion instead?
--
Ticket URL: <https://code.djangoproject.com/ticket/36489#comment:14>
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