gistfile1.pytb

class Task(models.Model):
  name        = models.CharField(max_length=128)

class Version(models.Model):
  is_active       = models.OneToOneField(Task, blank=True, null=True, related_name="active_version")

Traceback (most recent call last):

  File "/Users/john/Desktop/foo-env/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/Users/john/Desktop/foo-env/foo/utils.py", line 13, in wrapper
    return function(request, *args, **kw)

  File "/Users/john/Desktop/foo-env/foo/apps/development/views.py", line 99, in deactivate
    task.deactivate()

  File "/Users/john/Desktop/foo-env/foo/apps/games/models.py", line 63, in deactivate
    self.active_version = None

  File "/Users/john/Desktop/foo-env/lib/python2.7/site-packages/django/db/models/fields/related.py", line 271, in __set__
    setattr(value, self.related.field.attname, getattr(instance, self.related.field.rel.get_related_field().attname))