正在学习 Railscasts-china 中 omniauth-2-identity 使用，敲完代码，用 github 可以登录。但在 auth/identity/register 页面登录，填写相关信息，点击 connect，页面没发生跳转，填写的信息却被置空。

rails server 里面信息： Started POST "/auth/identity/register" for 127.0.0.1 at 2013-11-09 08:50:40 +0800 (0.2ms) BEGIN Identity Exists (0.2ms) SELECT 1 AS one FROM identities WHERE identities.nickname = BINARY 'wangyzyoga' LIMIT 1 Identity Exists (0.2ms) SELECT 1 AS one FROM identities WHERE identities.email = BINARY '[email protected]' LIMIT 1 (0.2ms) ROLLBACK

不知道是哪个环节错了？