Omniauth Facebook重定向到注册页面，而不是创建用户

Question

按照gem的教程完全操作后，我似乎仍然遇到了一些问题。我首先点击链接通过Facebook注册，被重定向到Facebook。我点击“好”并返回到我的注册页面。没有新用户被创建。如果我再次尝试点击注册链接，它只会刷新页面，地址栏中显示如下内容http://localhost:3000/register#_=_。我做错了什么？

用户模型

devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :omniauthable, omniauth_providers: [:facebook]

def self.from_omniauth(auth)
  where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
    user.email = auth.info.email
    user.password = Devise.friendly_token[0,20]
    user.first_name = auth.info.first_name
    user.last_name = auth.info.last_name
  end
end

回调控制器

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
  def facebook
    # You need to implement the method below in your model (e.g. app/models/user.rb)
    @user = User.from_omniauth(request.env["omniauth.auth"])

    if @user.persisted?
      sign_in_and_redirect @user, :event => :authentication #this will throw if @user is not activated
      set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
    else
      session["devise.facebook_data"] = request.env["omniauth.auth"]
      redirect_to new_user_registration_url
    end
  end
end

控制台代码

Started GET "/auth/facebook/callback?code=AQCh2rckn0dMOKNggTQJEbx_LTMGjNrDdumTu_Ay9Cwr_87A2pro_gOgFtSa866DouLuj4kMLVMMPfR3amp_X6rNSlAwOQ51RXK053vxhtEyJNY8StcqiOVZ6YqpGmfg8Zsz8RIXQr2xRclPmW9j9o8fqg83CoFiH1j-e_YOOuyCaX6xkoVN1eC3kjWSezg_WFm3p6aXu_XYxw1-Jf2j3Ijqt4kR4ySLHfmauj1z9UUcy5HANMIjaRx84NiZHNdJq6fzuAT37y9cXvP5HawonBBA0bG7ejAk5AATBYJj-kTXdCR9673cQ55O4GbAw_LCzzy7_YgHkFR9S038tP68HnXm&state=d013067bc67bd4bff43b6ac77bea69f5b113858cb234452a" for ::1 at 2015-07-12 19:28:55 -0400
I, [2015-07-12T19:28:55.026584 #7266]  INFO -- omniauth: (facebook) Callback phase initiated.
Processing by Users::OmniauthCallbacksController#facebook as HTML
  Parameters: {"code"=>"AQCh2rckn0dMOKNggTQJEbx_LTMGjNrDdumTu_Ay9Cwr_87A2pro_gOgFtSa866DouLuj4kMLVMMPfR3amp_X6rNSlAwOQ51RXK053vxhtEyJNY8StcqiOVZ6YqpGmfg8Zsz8RIXQr2xRclPmW9j9o8fqg83CoFiH1j-e_YOOuyCaX6xkoVN1eC3kjWSezg_WFm3p6aXu_XYxw1-Jf2j3Ijqt4kR4ySLHfmauj1z9UUcy5HANMIjaRx84NiZHNdJq6fzuAT37y9cXvP5HawonBBA0bG7ejAk5AATBYJj-kTXdCR9673cQ55O4GbAw_LCzzy7_YgHkFR9S038tP68HnXm", "state"=>"d013067bc67bd4bff43b6ac77bea69f5b113858cb234452a"}
  User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."provider" = ? AND "users"."uid" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["provider", "facebook"], ["uid", "836028396465704"]]
   (0.1ms)  begin transaction
   (0.0ms)  rollback transaction
Redirected to http://localhost:3000/register
Completed 302 Found in 59ms (ActiveRecord: 0.2ms)

- Carl Edwards

---

确保您使用了正确的密钥。 - Pavan

正在使用正确的密钥，但仍然被重定向。整天调试了这个问题，但没有成功让它工作。 - Carl Edwards

Answer 1

请将以下行添加到config/initializers/devise.rb文件中：

config.omniauth :facebook, "app id", "app secret", scope: 'email', info_fields: 'email'

Facebook API的新版本发生了变化， 介绍Graph API v2.4

更少的默认字段以提高性能：为了在移动网络连接上改善性能，我们默认减少了API返回的字段数。现在，您应该使用?fields=field1,field2语法来声明您想要API返回的所有字段。

- Mohammad Norhamizan

---

当你引用 email 时，它只是字面值还是与应用程序相关联的实际电子邮件地址？ - Carl Edwards

终于搞定了！感谢@MohammadNorhamizan和确认此解决方案有效的评论者。 - Carl Edwards

Answer 2

如果您正在关注devise的wiki页面，那么身份验证将失败。在控制器中，如果身份验证失败，则会重定向到注册路径。 就像Mohamed所说的那样，但现在您应该将first_name和last_name添加到您的info_fields中。 因此，在config/initializers/devise.rb中编写以下内容： config.omniauth :facebook，“应用程序ID”，“应用程序密钥”，范围：'电子邮件'，info_fields：'电子邮件，名字，姓氏'

- omarwaleed