'Return the URL redirect to. Keyword arguments from the
URL pattern match generating the redirect request
are provided as kwargs to this method.'

def get_redirect_url(self, **kwargs):

    if self.url:
        args = self.request.META['QUERY_STRING']
        if (args and self.query_string):
            url = ('%s?%s' % (self.url, args))
        else:
            url = self.url
        return (url % kwargs)
    else:
        return None
