diff -crB django_sorting-old/templatetags/sorting_tags.py django_sorting/templatetags/sorting_tags.py
*** django_sorting-old/templatetags/sorting_tags.py     2010-02-20 18:56:52.000000000 +0100
--- django_sorting/templatetags/sorting_tags.py 2010-02-20 19:03:45.000000000 +0100
***************
*** 1,6 ****
--- 1,8 ----
  from django import template
  from django.http import Http404
  from django.conf import settings
+ from django.db.models.query import QuerySet
+ from operator import attrgetter

  register = template.Library()

***************
*** 96,102 ****
          order_by = context['request'].field
          if len(order_by) > 1:
              try:
!                 context[key] = value.order_by(order_by)
              except template.TemplateSyntaxError:
                  if INVALID_FIELD_RAISES_404:
                      raise Http404('Invalid field sorting. If DEBUG were set to ' +
--- 98,119 ----
          order_by = context['request'].field
          if len(order_by) > 1:
              try:
!                 if isinstance(value, QuerySet):
!                     # more flexible but generally more error-prone check:
!                     #    callable(getattr(value, 'order_by', None))
!                     context[key] = value.order_by(order_by)
!                 # sort iterable
!                 elif hasattr(value, '__iter__'):
!                     if order_by[0]=='-': # descending order
!                         reverse = True
!                         order_by = order_by[1:]
!                     else: # ascending order (standard)
!                         reverse = False
!                     context[key] =\
!                         sorted(value,key=itemgetter(order_by),reverse=reverse)
!                 else:
!                     raise AttributeError("Expected QuerySet or iterable under\
!                                           template variable '%s'." % key)
              except template.TemplateSyntaxError:
                  if INVALID_FIELD_RAISES_404:
                      raise Http404('Invalid field sorting. If DEBUG were set to ' +