#16733: pk/id bug in multiple inheritance of concrete classes
-------------------------------------+-------------------------------------
Reporter: Leo | Owner: nobody
Type: Bug | Status: reopened
Milestone: | Component: Database layer
Version: SVN | (models, ORM)
Resolution: | Severity: Normal
Triage Stage: | Keywords:
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Changes (by Leo):
* status: closed => reopened
* resolution: needsinfo =>
Comment:
Sorry, I should have provided code. There's a couple of ways to demo this
problem.
Here's what I actually ran into. If you have a c that starts out like
this:
{{{#!python
>>> c.__dict__
{'_state': <django.db.models.base.ModelState object at 0x05D1F550>,
'a_ptr_id': 1,
'b_ptr_id': 9,
'id': 9}
}}}
You get this behavior:
{{{#!python
>>> c.id
9
>>> c.pk
1
}}}
Doing a `C.objects.get(pk=9)` fails as does a `C.objects.get(id=1)` while
their complements do work.
Another way to demo this issue from scratch is this data loss bug:
{{{#!python
>>> b = B.objects.create()
>>> b.id
1L
>>> c = C.objects.create()
>>> c.__dict__
Out[6]:
{'_state': <django.db.models.base.ModelState object at 0x05A48490>,
'a_ptr_id': 1L,
'b_ptr_id': 1L,
'id': 1L}
}}}
c should have a b_ptr_id of 2L since there's already a B with id of 1L.
The B with id of 1L just got clobbered by the data in c.
--
Ticket URL: <https://code.djangoproject.com/ticket/16733#comment:2>
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