Issue with Facebook Omniauth, devise with Ruby on Rails - ruby-on-rails

Question

I have scoured these pages for weeks looking for an answer. I am a newbie to Ruby, i followed a tutorial and was able to successfully complete it with little fuss. My issue is when i decided to add more functionality to my app by authenticating users with Facebook using the Omniauth gem in addition to the devise gem that is working perfectly.
I almost know the solution will be simple to the trained eye but i am at a loss since i have tried numerous suggestions on this site and others with varying degrees of success.
My current problem is whenever a user tries to sign in using Facebook, user gets authenticated but is redirected to the signup page. I fiddled around sometime last week and was able to successfully login but just once and kept getting redirected to signup page subsequently.
My required scenario is thus:
If a user clicks on the sign in with Facebook link, they should get redirected to Facebook for authentication, then sent back to my Ruby application and the values for email, first_name, last_name should get added to the User table for that user.
For a returning User,
All database values should be checked and user is logged in automatically without much fuss.
I would also like an email unique constraint to ensure we do not have multiple people with the same email.
I would really appreciate some sort of direction as to where i am getting it wrong.. Like i mentioned above, i am a total greenhorn in this space as i work mainly with IT infrastructure.
Please see my code below:
callbacks_controller.rb
class CallbacksController < 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
def failure
redirect_to root_path
end
def failure
redirect_to root_path
end
end
user.rb
class User < ApplicationRecord
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :omniauthable
has_many :reviews, dependent: :destroy
#validates :first_name, :last_name, presence: true
devise :omniauthable, :omniauth_providers => [:facebook]
def self.from_omniauth(auth)
where(email: auth.info.email).first_or_initialize.tap do |user|
user.email = auth.info.email
user.password = Devise.friendly_token[6,20]
user.first_name = auth.info.first_name
user.last_name = auth.info.last_name
user.save
end
end
end
def self.new_with_session(params, session)
super.tap do |user|
if data = session["devise.facebook_data"] && session["devise.facebook_data"]
["extra"]["raw_info"]
user.email = data["email"] if user.email.blank?
user.first_name = data["first_name"] if user.first_name.blank?
user.last_name = data["last_name"] if user.last_name.blank?
end
end
end
routes.rb
Rails.application.routes.draw do
devise_for :users, :controllers => { :omniauth_callbacks => "callbacks"}
resources :hospitals do
collection do
get 'search'
end
resources :reviews, except: [:show, :index]
end
get 'pages/Hospitals'
get 'pages/Labs'
get 'pages/Doctors'
get 'pages/about'
get 'pages/contact'
root'hospitals#index'
# For details on the DSL available within this file, see
http://guides.rubyonrails.org/routing.html
end
Console Response
Started GET "/users/auth/facebook" for ::1 at 2017-06-13 14:02:29 +0100
I, [2017-06-13T14:02:29.142018 #8385] INFO -- omniauth: (facebook) Request
phase initiated.
Started GET "/users/auth/facebook" for ::1 at 2017-06-13 14:02:29 +0100
I, [2017-06-13T14:02:29.488425 #8385] INFO -- omniauth: (facebook) Request
phase initiated.
Started GET "/users/auth/facebook/callback
code=AQAJ33qxsDJhSh2fKc8YH9YANZwK2BagO3fotR22iw3
cOeTN5G2HSvXbOioiwaQmwrZB3EEZKZBWlBAK4c
RVyddoG8oaeLQfEXjA0FPOvZtpw0XiuBGwOJIh7YaDSjt7O33Dn2mB7Vlu2YUaT-
DxlY3ioOVhNx8ymCE6TMGJx0slL-NvMB8b52IHSheMvPYTcMAoj2WXPgrLK8aH0eox_
7VbD8zaV0QFeJxqask3gaU4GTkGI50liO2SdF
T9fyFVWTgfORNP0yhwoH3HNlMGIznqSqbRGB43d
2qULNHglH6exDMCzgpyhD3Bmi2lxzcLc10"
for ::1 at 2017-06-13 14:02:29 +0100
I, [2017-06-13T14:02:29.731093 #8385] INFO -- omniauth: (facebook) Callback
phase initiated.
Processing by CallbacksController#facebook as HTML
Parameters:
{"code"=>"AQAJ33qxsDJhSh2fKc8YH9YANZwK2BagO3
fotR22iw3cOeTN5G2HSvXbOioiwaQmwrZB3EEZK
ZBWlBAK4cRVyddoG8oaeLQfEXjA0FPOvZtpw0XiuBGwOJIh7YaDSjt7O33Dn2mB7Vlu2YUaT-
DxlY3ioOVhNx8ymCE6TMGJx0slL-
NvMB8b52IHSheMvPYTcMAoj2WXPgrLK8aH0eox_
7VbD8zaV0QFeJxqask3gaU4GTkGI50liO2SdFT9fy
FVWTgfORNP0yhwoH3HNlMGIznqSqbRGB43d2qULNHglH6exDMCzgpyhD3Bmi2lxzcLc10"}
User Load (0.3ms) SELECT "users".*
FROM "users" WHERE "users"."email" IS NULL
ORDER BY "users"."id" ASC LIMIT ? [["LIMIT", 1]]
(0.2ms) begin transaction
(0.1ms) rollback transaction
Redirected to http://localhost:3000/users/sign_up
Completed 302 Found in 265ms (ActiveRecord: 0.6ms)
New Console response
User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."provider" = ?
AND
"users"."uid" = ? ORDER BY "users"."id" ASC LIMIT ? [["provider",
"facebook"], ["uid", "104903843446146"], ["LIMIT", 1]] (0.1ms) begin
transaction (0.1ms) rollback transaction Redirected to
localhost:3000/users/sign_up

Answer 1

Try below code:
def facebook
#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
model
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]
end
end