ruby-on-rails - 用户注册 Facebook 时如何修复空白电子邮件错误(通过 Omniauth)

Question

我允许在我的 Rails 网站上进行 Facebook 身份验证，并为此使用 Omniauth。我最近在生产中收到以下错误:

ActiveRecord::RecordInvalid: Validation failed: Email can't be blank, Email is invalid

通常 Facebook 注册工作正常，那么什么会导致这个特定错误？下面是我使用 Omniauth 创建用户的代码。

def self.create_from_omniauth(auth)
   where(auth.slice(:provider, :uid)).first_or_initialize.tap do |user|
      user.provider = auth.provider
      user.uid = auth.uid
      user.name = auth.info.name
      user.email = auth[:info][:email]
      user.password = SecureRandom.urlsafe_base64(n=10)
      user.save!
   end
end

Answer 1

其实关于这个issue in the omniauth-facebook repo已经有很多讨论了.

我认为用户TeamRainless is the one who got closest to the answer:

Some users have supplied a phone number which facebook uses as it's main authentication method instead of the email address. I believe the phone number is then encrypted and that becomes what the email address would normally be.

此问题的唯一解决方案是将用户重定向到将完成注册过程的表单。查看Railscasts OmniAuth Part 2 episode关于如何做到这一点。