README

これをRoR 3.0で使おうとしている
https://github.com/tardate/rails-twitter-oauth-sample

before_filterのoauth_login_requiredは呼ばれている
callback url: hoge.com/users/callback
で，コールバック時にエラー
Error message
>>
Unknown action
The action 'callback' could not be found for UsersController
<<

oauth_system.rb

require 'json'
require 'oauth'

require 'twitter_oauth'

module OauthSystem
  # controller method to handle twitter callback (expected after login_by_oauth invoked)
  def callback
  # ...
  end
  # ...
  protected
  # private methods ...
end

users_controller.rb

class UsersController < ApplicationController
  # include the oauth_system mixin
  require 'oauth_system'
  include OauthSystem
  # specify oauth to be on all user-specific actions
  before_filter :oauth_login_required, :except => [ :callback, :signout, :index, :show ]
  # ...
end