foreign key validate() fails for non-default databases

[marcop]

to reproduce:

1. configure two databases: default and other
2. have two models Person and Pet:

   class Person(models.Model):
       name = models.CharField(max_length=100)
   
   class Pet(models.Model):
       name = models.CharField(max_length=100)
       owner = models.ForeignKey(Person)
   

3. create Person instance named person in database 'other'
4. create Pet instance named pet in database 'other'
5. try calling pet.full_clean() or, more specifically, pet._meta.get_field('owner').validate(person.pk, person)

patch and test attached

[Ramiro Morales]

Patch with tests

[Ramiro Morales]

Seems multidb_management_tests.diff you a attached are actually tests for other ticket you opened #14662.

Attached another patch that only adds tests.

[Marco Paolini]

oh thanks. My bad.

The bug also affects 1.2

[Ramiro Morales]

(In [14580]) Fixed #14691 -- Made ForeignKey.validate() use the right database. Thanks Marco Paolini for the report.

[Ramiro Morales]

(In [14581]) [1.2.X] Fixed #14691 -- Made ForeignKey.validate() use the right database. Thanks Marco Paolini for the report.

Backport of [14580] from trunk