def url_for(self, action, controller='/character', **kwargs):
        kwargs.update({'action':action, 'controller':controller})
        if self.shortname:
            kwargs.update({'shortname':self.shortname})
        else:
            kwargs.update({'furid':self.furid})
        return h.url_for(**kwargs)

    def blog_post_url(self, slug):
        return self.url_for(controller='blog', action='view', slug=slug)


ERROR:
Module furboo.model:445 in blog_post_url
>>  return self.url_for(controller='blog', action='view', slug=slug)
Module furboo.model:430 in url_for
>>  return h.url_for(**kwargs)
Module routes.util:189 in url_for
>>  url = config.mapper.generate(*route_args, **newargs)
Module routes.base:949 in generate
>>  path = route.generate(**kargs)
Module routes.base:511 in generate
>>  urllist.append(url_quote(val, self.encoding))
Module routes.util:82 in _url_quote
>>  return urllib.quote_plus(unicode(string).encode(encoding), '/')
Module mako.runtime:91 in __str__
>>  raise NameError("Undefined")
<type 'exceptions.NameError'>: Undefined