Rails devise omniauth facebook - ruby-on-rails

Question

I can't get devise omniauth-facebook to work. I've followed the devise guide to no avail. I think my problem is the model is not retrieving info.
Model
class User < ActiveRecord::Base
has_attached_file :image, styles: {large: "1920x1080#", medium: "800x500#", thumb: "100x100"}, :default_url => "/images/:style/missing.png"
validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable,
:omniauthable, :omniauth_providers => [:facebook]
def admin?
admin
end
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]
user.name = auth.info.name # assuming the user model has a name
user.image = auth.info.image # assuming the user model has an image
puts request.env["omniauth.auth"]
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?
end
end
end
end
Routes.rb
Rails.application.routes.draw do
mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
devise_for :users do
delete 'logout' => 'sessions#destroy', :as => :destroy_user_session,
:controllers => { :omniauth_callbacks => "user/omniauth_callbacks" }
end
Controller
class User::OmniauthCallbacksController < Devise::OmniauthCallbacksController
# You should configure your model like this:
# devise :omniauthable, omniauth_providers: [:twitter]
# You should also create an action method in this controller like this:
# def twitter
# end
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 self.new_with_session(params, session)
if session["devise.user_attributes"]
new(session[devise.user_attributes], without_protection: true) do |user|
user.attributes = params
user.valid?
end
else
super
end
After I click "Login with facebook", it directs to a facebook url, I input a password, press enter, get redirected to the same page with a long url. (http://localhost:3000/demographics?code=AQDK1z40APoLiWykomxDDUljBUNHotenM4lzj_bZMhH8iQ74J_Nu_EUnPqBqkbNAeWQEPZwQs7YghqkB4eD7AoQLkN_RuYIlmotMtrJc4UyGRSe3CJIHcxp6kcB9BuYHA_Ldz0NMJvvGzOuvC-uDpFn6TyrzvV5v9LvivORXVduSsCy7_r6PcW8jxAkWqZzKyASXf26h8h3f_kha2d0KX6Ygft8ozN1HT9Xr-1y7ZtIKgTXEGMrqK950kASv2oTE0tQ5CYt6mfEZsVyLpykYIApOls8NLhjOaOIJewzV9EnLdSq0FbrvtedhhDmy-hg6IkRAbRVgwEkfUFsi9DXoxKyX&state=bdbf498f33f67ef57f3f54b846f870f21bb80c039c099f1a#=)
EDIT:
Now I am getting
Could not authenticate you from Facebook because "Invalid credentials".

Answer 1

So the problem was I didn't config the routes properly.
In fact, I had to remove all existing devise routes and add this line.
devise_for :users, :controllers => { :omniauth_callbacks => "users/omniauth_callbacks" }

Answer 2

This is what worked for me:
user model
devise :omniauthable, :omniauth_providers => [:facebook]
def self.from_omniauth(auth)
where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
user.provider = auth.provider
user.uid = auth.uid
user.email = auth.info.email
user.username = auth.info.name #gives full user name
user.password = Devise.friendly_token[0,20]
user.skip_confirmation!
user.save
end
end
devise.rb
config.omniauth :facebook, ENV['facebook_key'], ENV['facebook_secret'],
scope: 'email,public_profile', info_fields: 'email, first_name, last_name'
callbacks_controller.rb
class CallbacksController < ApplicationController
def facebook
#user = User.from_omniauth(request.env["omniauth.auth"])
if #user.persisted?
sign_in_and_redirect #user, :event => :authentication
flash[:notice] = "Logged in as #{#user.username}"
else
session["devise.facebook_data"] = request.env["omniauth.auth"]
redirect_to new_user_registration_url
end
end
def failure
redirect_to root_path
end
end
routes.rb
devise_for :users, controllers: { omniauth_callbacks: "callbacks" }

Answer 3

The problem is Facebook is not always returning email for user
from facebook developers https://developers.facebook.com/bugs/298946933534016
Some possible reasons:
No Email address on account
No confirmed email address on account
No verified email address on account
User entered a security checkpoint which required them to reconfirm
their email address and they have not yet done so
Users's email address is unreachable
Set an condition in your controller if request.env["omniauth.auth"].info.email.present? see the script below.
class User::OmniauthCallbacksController < Devise::OmniauthCallbacksController
def facebook
puts request.env["omniauth.auth"] # check if request.env["omniauth.auth"] is provided an email
if request.env["omniauth.auth"].info.email.present?
#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
else
redirect_to new_user_registration_url, notice: "Couldn't connect to your #{request.env["omniauth.auth"].provider} account. Try to sign up."
end
end
end