#26320: Multi-table inheritance pointer merged with another OneToOneField
-------------------------------------+-------------------------------------
Reporter: BertrandBordage | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by timgraham):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
The promotion of the `OneToOneField` to a `primary_key` happens
[https://github.com/django/django/blob/b886f166b332bda96b178a7327a5118f75d804b6/django/db/models/options.py#L239-L250
in options.py]. I didn't see a mention of the behavior in the
[https://docs.djangoproject.com/en/dev/topics/db/models/#multi-table-
inheritance multi-table inheritance docs] but it seems to date to merge of
the queryset refactor branch in 9c52d56f6f8a9cdafb231adf9f4110473099c9b5.
I don't know if we can change the behavior but we could at least document
it.
Is there some problem defining your model like this:
{{{
class Child(Parent):
parent_ptr = models.OneToOneField(Parent, primary_key=True,
related_name='+')
parent_ptr2 = models.OneToOneField(Parent, null=True,
related_name='+')
}}}
I didn't get any check errors in that case but I didn't test any queries.
--
Ticket URL: <https://code.djangoproject.com/ticket/26320#comment:1>
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