Question

我为nil获取了未定义的方法`[]'：NilClass

 NoMethodError in Users::OmniauthCallbacksController#facebook

  undefined method `[]' for nil:NilClass

  Rails.root: /home/krishna/picer
  Application Trace | Framework Trace | Full Trace

  app/models/user.rb:13:in `find_for_facebook_oauth'
  app/controllers/users/omniauth_callbacks_controller.rb:4:in `facebook'

这是我的user.rb代码

class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable:omniauthable
devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable,
     :omniauthable

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

def self.find_for_facebook_oauth(access_token, signed_in_resource=nil)
data = access_token['extra']['user_hash']
if user = User.find_by_email(data["email"])
  user
else # Create a user with a stub password.
  User.create(:email => data["email"], :password => Devise.friendly_token[0,20])
  end
end

 def self.new_with_session(params, session)
  super.tap do |user|
    if data = session["devise.facebook_data"] && session["devise.facebook_data"]  ["extra"]["user_hash"]
    user.email = data["email"]
   end
  end
 end
end

omniauth回调控制器代码

 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
 def facebook
 # You need to implement the method below in your model
 @user = User.find_for_facebook_oauth(request.env["omniauth.auth"], current_user)

if @user.persisted?
  flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Facebook"
  sign_in_and_redirect @user, :event => :authentication
else
  session["devise.facebook_data"] = env["omniauth.auth"]
  redirect_to new_user_registration_url
 end
end

def passthru
  render :file => "#{Rails.root}/public/404.html", :status => 404, :layout => false
 end

end

我收到错误第四行user.rb我使用了这个https://github.com/ryanatwork/devise-omniauth

的示例

Answer 1

您应该收到使用access_token['info']['email']而不是access_token['extra']['user_hash']['email']的用户电子邮件。

我不认为access_token['extra']中的数据遵循其他约定，因此您应该格外小心并测试您尝试访问的属性是否存在。如果你只有一个提供者，那就没那么重要了，但如果你有几个提供者就是这样。

Users :: OmniauthCallbacksController #facebook中的NoMethodError

1 个答案: