[bug] OneToOneField referencing a different app does not always register a Reverse Lookup.

[nowell strite]

OneToOneField does not register a Reverse Lookup when the relation references a different application. See the example below.

Create project, application, and models

/project/appone/models.py

from django.db import models

class Foo(models.Model):
    w = models.CharField(maxlength=20)

class Bar(models.Model):
    x = models.CharField(maxlength=10)
    y = models.ManyToManyField(Foo)

/project/apptwo/models.py

from django.db import models
from project.appone.models import Bar

class Baz(models.Model):
    bar = models.OneToOneField(Bar)

Setup test data

• Add appone and apptwo to the INSTALLED_APPLICATIONS
• Run python manage.py syncdb
• Run python manage.py shell

  >>> from appone.models import *
  >>> from apptwo.models import *
  >>> a = Foo()
  >>> a.w = '1'
  >>> a.save()
  
  >>> b = Bar()
  >>> b.x = '2'
  >>> b.save()
  >>> b.y = [a]
  
  >>> c = Baz()
  >>> c.bar = b
  >>> c.save()
  

• Next exit the shell environment to simulate a fresh environment
• run python manage.py shell

This doesn't work

>>> from appone.models import Bar
>>> d = Bar.objects.all()[0]
>>> d.baz
Traceback (most recent call last):
  File "<console>", line 1, in ?
AttributeError: 'Bar' object has no attribute 'baz'

This works

>>> from appone.models import Bar
>>> d = Bar.objects.get(pk=1)
>>> d.baz

[James Bennett]

IIRC, both models have to be imported before the reverse relationship will exist; if no model with a relation to one currently available has been imported, Django has no way of knowing that such a relation exists.

[(none)]

Milestone Version 1.0 deleted