Ruby on rails 当用户名/密码错误时设计错误消息

我的问题是，当设计登录失败时，我看不到任何错误消息。发生这种情况时，我被重定向到designe:：sessioncontroller#new，它没有设置任何错误

Started POST "/users/sign_in" for 127.0.0.1 at 2014-08-17 06:30:59 +0300
Processing by Devise::SessionsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"4ZgT4DtyyNYNGHRbwCVASolL3CQEqIeMtPlOOy7EBik=", "user"=>{"username"=>"setdddd", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Войти"}
Completed 401 Unauthorized in 3ms
Processing by Devise::SessionsController#new as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"4ZgT4DtyyNYNGHRbwCVASolL3CQEqIeMtPlOOy7EBik=", "user"=>{"username"=>"setdddd", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Войти"}
[]
  Rendered devise/shared/_links.erb (0.1ms)
  Rendered devise/sessions/new.html.erb within layouts/application (40.0ms)
  Rendered application/_header.erb (0.5ms)
  Rendered application/_footer.erb (0.0ms)
Completed 200 OK in 50ms (Views: 47.8ms | ActiveRecord: 0.0ms)

---

所以问题是Desive配置中是否有任何开关允许我向用户显示错误消息，而不仅仅是重定向？

您是否在适当的位置输出您的错误消息？它看起来像是根据情况（即登录失败等）设置flash[：notice]和flash[：alert]。由您来确保将这些值输出到页面。有关更多详细信息，请参阅设计。

可能post会有所帮助。Thanx，我的错，我在文档中遗漏了这个*（这是一个很好的答案。问题很简单，但可能很常见。