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我想使用身份提供程序为我的应用程序使用单独的管理员登录。

我已经在 config/initializers/omniauth.rb 中写了这个

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :identity, :model => Credential, :on_failed_registration =>SessionsController.action(:register)
  provider :identity, :model => Credential, :name => 'admin', :on_failed_registration =>      SessionsController.action(:login_admin)
  provider :google_oauth2, '000000000.apps.googleusercontent.com', '00000000000'
end

在 config/routes.rb

 match '/auth/admin/callback', :to => 'sessions#authenticate_admin'

在 app/controllers/sessions_controller.rb

def authenticate_admin
  auth_hash = request.env['omniauth.auth']
  session[:admin_user] = auth_hash['user_info']['email']
  if admin?
    redirect_to '/'
  else
    render :text => '401 Unauthorized', :status => 401
  end
end

但是当我尝试访问 request.env['omniauth.auth'] 时,它总是为零。虽然在 sessison#create 操作中为普通用户使用默认回调时可以访问它。我只想知道这段代码中是否遗漏了什么。我正在关注这个博客http://www.intridea.com/blog/2011/1/31/easy-rails-admin-login-with-google-apps-and-omniauth

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