django/contrib/sites/managers.py

   1 from django.conf import settings
   2 from django.db import models
   3 from django.db.models.fields import FieldDoesNotExist
   4
   5 class CurrentSiteManager(models.Manager):
   6     "Use this to limit objects to those associated with the current site."
   7     def __init__(self, field_name='site'):
   8         super(CurrentSiteManager, self).__init__()
   9         self.__field_name = field_name
  10         self.__is_validated = False
  11
  12     def get_query_set(self):
  13         if not self.__is_validated:
  14             try:
  15                 self.model._meta.get_field(self.__field_name)
  16             except FieldDoesNotExist:
  17                 raise ValueError, "%s couldn't find a field named %s in %s." % \
  18                     (self.__class__.__name__, self.__field_name, self.model._meta.object_name)
  19             self.__is_validated = True
  20         return super(CurrentSiteManager, self).get_query_set().filter(**{self.__field_name + '__id__exact': settings.SITE_ID})