Ok, I've reopened a ticket here http://code.djangoproject.com/ticket/12883
adding some required informations.

On 5 Mar, 00:41, Russell Keith-Magee <freakboy3...@gmail.com> wrote:
> On Thu, Mar 4, 2010 at 9:54 PM, eXt <restless.be...@gmail.com> wrote:
> > Hi!
>
> >   I've upgraded my Django to 1.2 (1.2-beta-1, tried also trunk) and
> > after that my application has started to throw an exception:
> > ValueError: Cannot add "<User: XXX>": instance is on database
> > "default", value is is on database "None".
>
> > The code causing the problem is:
>
> > (...)
> > project = form.save()
> > admin_profiles =
> > Member.objects.select_related().filter(group__name='Admin')
> > for admin_profile in admin_profiles:
> >    project.users.add(admin_profile.user)
>
> > It is just adding users to a project.users which is m2m to auth.User.
> > Error report is:
>
> > Traceback (most recent call last):
>
> >  File "/var/www/django/someapp/parts/django/django/core/handlers/
> > base.py", line 101, in get_response
> >   response = callback(request, *callback_args, **callback_kwargs)
>
> >  File "/var/www/django/someapp/webshare/utils.py", line 21, in wrapper
> >   context = view_func(*args, **kwargs)
>
> >  File "/var/www/django/someapp/webshare/apps/projects/views.py", line
> > 100, in add_project
> >   project.users.add(admin_profile.user)
>
> >  File "/var/www/django/someapp/parts/django/django/db/models/fields/
> > related.py", line 465, in add
> >   self._add_items(self.source_field_name, self.target_field_name,
> > *objs)
>
> >  File "/var/www/django/someapp/parts/django/django/db/models/fields/
> > related.py", line 525, in _add_items
> >   (obj, self.instance._state.db, obj._state.db))
>
> > ValueError: Cannot add "<User: XXX>": instance is on database
> > "default", value is is on database "None"
>
> > Everything is ok when I go back to Django 1.1.1. Is there something
> > I've missed in my configuration or it's a bug?
>
> Sounds like an edge case that has been missed to me. This error
> message that is being reported shouldn't be an problem - the value
> should be assignable to default.
>
> Please open a ticket, and assign it to the 1.2 milestone.
>
> Yours,
> Russ Magee %-)

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