fix facebook registration

app/controllers/users/omniauth_callbacks_controller.rb

 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
+      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"]

app/models/user.rb

@@ -4,6 +4,11 @@ class User < ApplicationRecord
          :recoverable, :rememberable, :omniauthable, 
          omniauth_providers: [:facebook, :google_oauth2]
 
+  before_create do
+    self.email = 'example123@gmail.com' if email.nil?
+  end
+
+  validates :email, presence: false
 
   def self.new_with_session(params, session)
     super.tap do |user|

config/initializers/devise.rb

@@ -26,12 +26,7 @@ Devise.setup do |config|
 
   config.omniauth :facebook, "2429624190692901", "03da24c1517b0bfa4acc70852f61fb60",
                   callback_url: "http://localhost:3000/users/auth/facebook/callback",
-                  scope: 'public_profile,email',
-                  info_fields: 'email,first_name,last_name,gender,birthday,location,picture',
-                  client_options: {
-                    site: 'https://graph.facebook.com/v2.11',
-                    authorize_url: "https://www.facebook.com/v2.11/dialog/oauth"
-                }
+                  scope: 'email', info_fields: 'email,name'
 
   config.omniauth :google_oauth2, "444952886435-8s76oeuc53otc8q84jork9mq4php7e7t.apps.googleusercontent.com",
                   "vfJkP71fOkfDKVYa3RgXR3lW", {}