Omniauth 重定向

Question

所以我的 Omniauth 和 Twitter 验证功能大约 95%，换句话说，它几乎可以完全正常工作。当单击 |使用 Twitter 登录 |按钮，它将我重定向到 Twitter，然后提示我输入我的 Twitter 凭据，然后重定向回应用程序。

但是，我没有在 Twitter 身份验证过程之后登录，而是在登录页面上收到以下错误：

1 error prohibited this user from being saved:

    Email can't be blank

在 /posts 页面的情况下，如何让 Omniauth 将我重定向到登录页面？当 Omniauth 应该通过 Twitter 验证授权我时，为什么会产生这样的错误？

用户模型：

class User < ActiveRecord::Base
  has_many :authentications

  # Include default devise modules. Others available are:
  # :token_authenticatable, :lockable, :timeoutable and :activatable
  devise :database_authenticatable, :registerable, 
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation
  # attr_accessible :title, :body

  def apply_omniauth(omniauth)
    self.email = omniauth['info']['email'] if email.blank?
    authentications.build(:provider => omniauth['provider'], :uid => omniauth['uid'])

  end

  def password_required?
    (authentications.empty? || !password.blank?) && super
  end


end

身份验证控制器：

class AuthenticationsController < ApplicationController
  def create
    omniauth = request.env["omniauth.auth"]
    authentication = Authentication.find_by_provider_and_uid(omniauth['provider'], omniauth['uid'])
    if authentication
      flash[:notice] = "Signed in successfully."
      sign_in_and_redirect(:user, authentication.user)
    elsif current_user
      current_user.authentications.create!(:provider => omniauth['provider'], :uid => omniauth['uid'])
      flash[:notice] = "Authentication successful."
      redirect_to authentications_url
    else
      user = User.new
      user.apply_omniauth(omniauth)
      if user.save
        flash[:notice] = "Signed in successfully."
        sign_in_and_redirect(:user, user)
      else
        session[:omniauth] = omniauth.except('extra')
        redirect_to new_user_registration_url
      end
    end
  end
end

注册控制器：

class RegistrationsController < Devise::RegistrationsController
  def create
    super
    session[:omniauth] = nil unless @user.new_record?
  end

  private

  def build_resource(*args)
    super
    if session[:omniauth]
      @user.apply_omniauth(session[:omniauth])
      @user.valid?
    end
  end
end

Answer 1

我才想起来，原因其实很简单，twitter在omniauth请求中没有返回email，所以它会将你重定向到新的用户注册页面，你必须填写你的email。

https://github.com/intridea/omniauth/wiki/Auth-Hash-Schema

此外，这可能会有所帮助

Skip email validation for omniauth-twitter on devise 2.0