https://github.com/plataformatec/devise/wiki/How-Tos =====> https://github.com/plataformatec/devise/wiki/How-To:-Allow-users-to-sign-in-using-their-username-or-email-address

#1 楼 @KoALa 不行 方便留 skype 或者微信不？？

您的 这个 说话 方式 好 累

修改 config/devise.rb

# ==> Configuration for any authentication mechanism # Configure which keys are used when authenticating a user. The default is # just :email. You can configure it to use [:username, :subdomain], so for # authenticating a user, both parameters are required. Remember that those # parameters are used only when authenticating and not when retrieving from # session. If you need permissions, you should implement that in a before filter. # You can also supply a hash where the value is a boolean determining whether # or not authentication should be aborted when the value is not present.

config.authentication_keys = [:username]

#4 楼 @luolinae86 你好，这个已经修改了，可是单单这个修改不够啊～我参照了http://stackoverflow.com/questions/18026594/rails-4-devise-login-with-email-or-username-and-strong-parameters 这篇文章，可是还是出现了错误 undefined method `attr_accessible'

#3 楼 @alucardpj 恩恩，抱歉，这样会比较好点～

#4 楼 @luolinae86 搞定了，谢谢～！