#25461: Model _meta API Migration Guide
-------------------------------+--------------------
Reporter: ad-65 | Owner: nobody
Type: Bug | Status: new
Component: Documentation | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------+--------------------
The _meta API migration guide for Django 1.8 shows a replacement for
_meta.get_all_related_objects() that isn't quite right when used on a
multi-table inheritance child model.
{{{#!python
class Party():
is_active = models.BooleanField(default=True)
class Contact(Party):
first_name = models.CharField(max_length=128)
last_name = models.CharField(max_length=128)
}}}
{{{#!python
[f for f in Contact._meta.get_all_related_objects()]
...
[]
[f for f in Contact._meta.get_fields() if (f.one_to_many or f.one_to_one)
and f.auto_created]
...
[<django.db.models.fields.related.OneToOneField: party_ptr>]
}}}
The _meta.get_all_related_objects() method would return nothing assuming
no other external relations but the replacement method would return the
automatically created OneToOneField pointing to the parent. Maybe changing
the docs to use is_concrete would work, unless this causes other problems?
{{{#!python
[f for f in Contact._meta.get_all_related_objects()]
...
[]
[f for f in Contact._meta.get_fields() if (f.one_to_many or f.one_to_one)
and f.auto_created and not f.concrete]
...
[]
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25461>
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