Я использую Mongodb в качестве базы данных в рельсах, и я получил ошибку при использовании / auth / linkedin / callback

NoMethodError в AuthenticationsController # создать неопределенный метод [] 'для nil: NilClass Rails.root: / home / prem / Music / heronhrm Трассировка приложения | Framework Trace | Full Trace app / models / user.rb: 57: в apply_omniauth 'app / controllers / authentications_controller.rb: 19: в `create'

Также, когда я удаляюself.email = omniauth['user_info']['email'] if email.blank? от usermodel, то ошибки проверки возникают в

users / sign_up E-mail не может быть пустым Я хочу реализовать для Twitter, LinkDin и Facebook.

моя аутентификация.рб

 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

моя модель пользователя такая

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

Мой контроллер аутентификации похож на этот

    class AuthenticationsController < ApplicationController
  def index
    @authentications = current_user.authentications if current_user
  end

 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
  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

Мой контроллер регистрации такой

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