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