Problem with two databases

I'm making simple application to manage equipment. I've
used django-ldapdb
(http://opensource.bolloretelecom.eu/projects/django-ldapdb/) for user
management (not for authentication, for which i'm using PAM). After
heavy googling i've managed to connect all this together - LDAP as
second database), so i can use LDAP-based users as owners of equipment
(here are most important parts of models):

class LdapUser(ldapdb.models.Model):
"""
Class for representing an LDAP user entry.
"""
class Meta:
managed = False
[...]
full_name = CharField(db_column='cn')
username = CharField(db_column='uid', primary_key=True)

class Equipment(models.Model):
number = models.CharField(unique=True, max_length=13)
state = models.ForeignKey(State)
model = models.CharField(max_length=255)
owner = ForeignKeyAcrossDb(LdapUser)
description = models.CharField(blank=True, max_length=255)
type = models.ForeignKey(Type)
place = models.ForeignKey(Place)

def __unicode__(self):
return u"%s (%s)" % (self.type, self.number)

i googled out ForeignKeyAcrossDb, it's not my code. Also i have googled
out database router (for main database):

class DefRouter(object):
def db_for_read(self, model, **hints):
if model._meta.app_label == 'equipment_control':
return 'default'
return None

def db_for_write(self, model, **hints):
if model._meta.app_label == 'equipment_control':
return 'default'
return None

def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label == 'equipment_control' or
obj2._meta.app_label == 'equipment_control':
return True
return None

def allow_syncdb(self, db, model):
if db == 'default':
if model._meta.app_label == 'equipment_control':
return True
elif model._meta.app_label == 'equipment_control':
return False
return None

And basically it works - i can edit users and also i can use LDAP-based
users in my Equipments. But there are some issues:

* i can't filter Equipments using 'owner' field:
Equipment.objects.filter(owner__full_name__contains="name")
ERROR: relation "equipment_control_ldapuser" does not exists
(which is true of course, because engine tries to find name in database
- postgresql in my example)

* i can't customize Admin panel - for example (in admin.py):

class EquipmentModelAdmin(reversion.VersionAdmin):
list_display = ("owner", "type", "number", "description")

and i have "ERROR: relation "equipment_control_ldapuser" does not
exists" error.

Is there any possibility to use LDAP transparently? Or maybe some
workaround exists? I'm pretty new to Django (it's my first "true"
application) and my knowledge of python is not very high also, so i
can't figure out any solution. Thanks in advance for any help.

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