#36183: Model o2o inheritance with abstract models does not "evaluate" a lazy
relationship
-------------------------------------+-------------------------------------
Reporter: BeryCZ | Owner: (none)
Type: Bug | Status: closed
Component: Database layer | Version: 5.1
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Simon Charette):
Your `AbstractPageType` definition is invalid as it's not allowed to
define a `parent_link` on a model that doesn't directly inherit from the
referenced model even when abstract.
The correct way to do this is to have the abstract model defining the
parent link subclass the concrete model (abstract MTI). This means you
should be able to achieve what you're after by re-organizing your model
definition to make sure `AbstractPageType` does inherit from `Page`
{{{#!python
class AbstractPage(models.Model):
mtime = models.DateTimeField(
verbose_name="Last modification at",
auto_now=True,
)
class Meta:
abstract = True
class Page(AbstractPage):
number = models.IntegerField()
class AbstractPageType(Page):
page = models.OneToOneField(
"Page",
verbose_name="ID",
primary_key=True,
on_delete=models.CASCADE,
related_name="%(class)s",
parent_link=True,
)
class Meta:
abstract = True
class ArticlePage(AbstractPageType):
pass
class OtherPage(AbstractPageType):
pass
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/36183#comment:3>
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