#31498: GenericRelation's get_internal_type() incorrectly reports
"ManyToManyField".
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Reporter: George Dorn | Owner: nobody
Type: Bug | Status: new
Component: contrib.contenttypes | Version: 3.0
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 |
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I have two models, one containing a GFK to the other (and presumably
others models).
{{{
#!div style="font-size: 80%"
Code highlighting:
{{{#!python
class Example(models.Model):
text = models.TextField()
example_gfk = GenericRelation(
"myapp.ExampleGFK",
related_query_name="example",
)
class ExampleGFK(Bulkable):
text = models.TextField()
content_type = models.ForeignKey(ContentType,
on_delete=models.CASCADE)
object_id = models.PositiveIntegerField()
content = GenericForeignKey("content_type", "object_id")
}}}
}}}
When I inspect Example._meta.get_field('example_gfk').get_internal_type(),
it reports back a ManyToManyField. This can't be right, though; as a
reverse relationship, it should be a ManyToOneRel; an ExampleGFK can't be
related to more than one Example object.
Perhaps there's a solid reason for this that eludes me, like it tricks
some part of the admin or other part of the ORM to behave correctly. If
so, at the very least a note in the documentation or a docstring in the
code could clarify that reason.
--
Ticket URL: <https://code.djangoproject.com/ticket/31498>
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