我正在使用rails cast omniauth，我收到此错误

我使用Mongodb作为rails中的数据库，使用/ auth / linkedin / callback时出错

AuthenticationsController＃中的NoMethodError为nil创建未定义的方法[]’：NilClass Rails.root：/ home / prem / Music / heronhrm Application Trace | 框架跟踪| 完整跟踪app / models / user.rb：57：在apply_omniauth’app / controllers / authentications_controller.rb：19：在’create’中

当我删除self.email = omniauth['user_info']['email'] if email.blank? 从usermodel然后出现validation错误

users / sign_up电子邮件不能为空我想为twitter，linkdin和facebook实现。

我的身份validation.rb

  class Authentication include Mongoid::Document belongs_to :user field :user_id, :type => String field :provider, :type => String field :uid, :type => String def self.find_by_provider_and_uid(provider, uid) where(provider: provider, uid: uid).first end end 

我的用户模型是这样的

 def apply_omniauth(omniauth) self.email = omniauth['user_info']['email'] if email.blank? authentications.build(:provider => omniauth['provider'], :uid => omniauth['uid']) end def password_required? (authentications.empty? || !password.blank?) && super end 

我的身份validation控制器是这样的

  class AuthenticationsController  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 def destroy @authentication = current_user.authentications.find(params[:id]) @authentication.destroy flash[:notice] = "Successfully destroyed authentication." redirect_to authentications_url end protected # This is necessary since Rails 3.0.4 # See https://github.com/intridea/omniauth/issues/185 # and http://www.arailsdemo.com/posts/44 def handle_unverified_request true end end 

我的注册控制器是这样的

 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

在你的app / models / authentication.rb里面添加这个

 def self.find_by_provider_and_uid(provider, uid) where(provider: provider, uid: uid).first end 

Answer 2

你有没有在你的模型中添加它？ 如果没有添加，请添加此项，然后尝试

 key :provider, String key :uid, String