Omniauth-facebook with Devise: "Missing passthru" errors

I have Devise authentication installed with no problems. Now I'm trying to add an option to log in with Facebook, using Omniauth-facebook.

I followed the instructions in this guide, but I'm getting errors about missing "Passthru" documentation, when visiting the url localhost:3000/auth/facebook.

Here's the first error I got:

Unknown action
The action 'passthru' could not be found for RegistrationsController

I tried a bandaid fix by just adding an empty "passthru" action to my controller:

def passthru
end

And that resolved that error, but I got a different one in return:

Template is missing
Missing template registrations/passthru, devise/registrations/passthru, devise/passthru, application/passthru with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. Searched in: * "/home/user/project/app/views" * "/home/user/.rvm/gems/ruby-2.0.0-p648@railstutorial_rails_4_0/gems/devise-3.5.2/app/views"

I tried creating a "passthru.html.erb" in the stated folders, but that error remained. In any case, I think these errors are emblematic of a deeper problem.

Has anyone else run into this problem? All I could find on it was this SO question, but none of the answers were helpful.

---

My code so far:

Gemfile

gem 'devise'
gem 'omniauth-facebook'
gem 'omniauth'

routes.rb

devise_for :members, controllers: { registrations: 'registrations', omniauth_callbacks: 'registrations' }

member.rb

  devise :database_authenticatable, :registerable,
         :omniauthable, :omniauth_providers => [:facebook]


  def self.from_omniauth(auth)
    where(provider: auth.provider, uid: auth.uid).first_or_create do |member|
      member.email = auth.info.email
      member.password = Devise.friendly_token[0,20]
      member.title = auth.info.name
    end
  end

registrations_controller.rb

  def facebook
    @member = Member.from_omniauth(request.env["omniauth.auth"])
    if @member.persisted?
      sign_in_and_redirect @member, :event => :authentication
      set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
    else
      session["devise.facebook_data"] = request.env["omniauth.auth"]
      redirect_to new_member_registration_url
    end
  end

  def failure
    redirect_to root_path
  end

  def passthru
  end

initializers/devise.rb

config.omniauth :facebook, "<app_id>", "<app_secret>"

Try this :

Update GemFile:

gem 'omniauth-facebook'
gem 'omniauth'

Goto rails_apps/yourapp/config/initializers/devise.rb

Devise.setup do |config|
   config.omniauth :facebook, "KEY", "SECRET"
 end

Update the User Model

class User < ActiveRecord::Base

         devise :database_authenticatable, :registerable,
        :recoverable, :rememberable, :trackable, :validatable,
    :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.password = Devise.friendly_token[0,20]
         end
     end
    end

Goto : rails_apps/yourapp/config/routes.rb

Rails.application.routes.draw do
  devise_for :users
  resources :users
end

Edit in View

 <%= link_to "Sign in with Facebook", "/auth/facebook", id: "sign_in" %>