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from django.conf import settings
from django.db import models
from django.db.models.fields import FieldDoesNotExist
class CurrentSiteManager(models.Manager):
"Use this to limit objects to those associated with the current site."
def __init__(self, field_name='site'):
super(CurrentSiteManager, self).__init__()
self.__field_name = field_name
self.__is_validated = False
def get_query_set(self):
if not self.__is_validated:
try:
self.model._meta.get_field(self.__field_name)
except FieldDoesNotExist:
raise ValueError("%s couldn't find a field named %s in %s." % \
(self.__class__.__name__, self.__field_name, self.model._meta.object_name))
self.__is_validated = True
return super(CurrentSiteManager, self).get_query_set().filter(**{self.__field_name + '__id__exact': settings.SITE_ID})
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