[Django] #23564: Django migration fails on unqiue_together with model subclass references

[Django]

#23564: Django migration fails on unqiue_together with model subclass references
----------------------------+--------------------
     Reporter:  dbinetti    |      Owner:  nobody
         Type:  Bug         |     Status:  new
    Component:  Migrations  |    Version:  1.7
     Severity:  Normal      |   Keywords:
 Triage Stage:  Unreviewed  |  Has patch:  0
Easy pickings:  0           |      UI/UX:  0
----------------------------+--------------------
 I've searched around and can't find a bug for this behavior, so here
 goes...

 With this model inheritance:

 {{{
 class Account(models.Model):
     name = models.CharField (...)

 class Source(models.Model):
     name = models.CharField(...)
     account = models.ForeignKey('Account', related_name='sources')

 class SubSource(Source):
     uid = models.CharField(...)

     class Meta:
         unique_together = (
             ("account", "uid"),
         )
 }}}

 My intended behavior here is to ensure I can only have a single
 combination of Accounts and (external) SubSources.  I may have multiple
 instances of the same external sub-source on the table if used by
 different accounts, which is why i'm not simply using `unique` on the
 `uid` field.

 I can run `django-admin.py check`, which passes, and `django-admin.py
 makemigrations`, which passes.  But when i try to run `django-admin.py
 migrate` it fails with:

 {{{
 django.db.utils.ProgrammingError: column "account_id" named in key does
 not exist
 }}}

 the generated migration script looks like this:

 {{{
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals

 from django.db import models, migrations


 class Migration(migrations.Migration):

     dependencies = [
         <snip>
     ]

     operations = [
         migrations.AlterUniqueTogether(
             name='subsource',
             unique_together=set([('account', 'uid')]),
         ),
     ]
 }}}


 I'm sorry that I'm not skilled enough to produce an actual test case.
 Thanks.

--
Ticket URL: <https://code.djangoproject.com/ticket/23564>
Django <https://code.djangoproject.com/>
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