gistfile1.py

class KeepQueryStringModelAdmin(admin.ModelAdmin):
    """
    A ModelAdmin that "fixes" the default behavior of redirecting to the
    default change list after a save.
    This class remembers the change list query string that was used for the
    change list and redirects to it after a save, maintaining the ordering,
    filtering, & pagination.

    Thanks to Vlada Macek http://djangopeople.net/tuttle/
    
    """
    def _qstr_sesskey(self):
        return 'last_admin_changelist_query_string_' + repr(self.__class__)

    def changelist_view(self, request, extra_context=None):
        """ 
        Remember the listing pager, ordering and filtering...
        """

        if hasattr(request, 'session'):
            request.session[self._qstr_sesskey()] = 
                                               request.META.get('QUERY_STRING')

        return super(KeepQueryStringModelAdmin, self).changelist_view(
                                                        request, extra_context)

    def response_change(self, request, obj):
        """ 
        ... and restore it after "Save" button is used.
        """

        r = super(KeepQueryStringModelAdmin, self).response_change(
                                                                  request, obj)
        if hasattr(request, 'session'):
            l = request.session.get(self._qstr_sesskey())
            if r['Location'] == '../' and l:
                r['Location'] += '?' + l
        return r