#23614: Altering unique_together sometimes missing deleted fields
----------------------------+--------------------
     Reporter:  Naddiseo    |      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
----------------------------+--------------------
 Steps to reproduce:
 1. Create an App `spam`
 2. Create two models `spam.Eggs` and `spam.Spam`

 {{{
 #!python

 class Eggs(models.Model):
     pass


 class Spam(models.Model):
     class Meta:
         unique_together = (
            ('a', 'b'),
         )

     a = models.ForeignKey(Eggs)
     b = models.CharField(max_length=10)
 }}}

 3. Make migrations
 4. Create an App `ham`
 5. Create model `ham.Ham`

 {{{
 #!python
 class Ham(models.Model): pass
 }}}
 6. Add foreignkey to `Spam.Spam`: `c = models.ForeignKey('ham.Ham')`
 7. Make Migrations
 8. Delete field `Spam.a`
 9. Change `Spam.unique_together` to `('c', 'b')`
 10. Make Migrations
 11. Run migrations.

 Output:

 > django.db.models.fields.FieldDoesNotExist: Spam has no field named u'a'


 I think this might be related to issue #23505 since that is what I was
 actually trying to reproduce.

--
Ticket URL: <https://code.djangoproject.com/ticket/23614>
Django <https://code.djangoproject.com/>
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