Rails 4 Devise + Omniauth Github Routing Error - ruby-on-rails-4

Question

I'm using Rails 4.1.1 and I'm trying to create omniauth github with my devise gem in my application. But I get routing error, I'm following Railscast #235 revised on this topic.
Right now, I'm trying to do the same thing Ryan Bates is doing, which is raise omniauth.auth as a yaml to the screen, but I get the error:
No route matches [GET] "/auth/github/callback"
How do I fix this error?
Here you have my routes:
Rails.application.routes.draw do
devise_for :users, controllers: {omniauth_callbacks: "omniauth_callbacks"}
root to: 'questions#index'
resources :questions do
resources :answers, only: [:create]
end
resources :users, only: [:show]
#USERS CONTROLLER MY ROUTES
get "adding_likes/(:id)/(:like)/(:current_user_id)", to: "answers#adding_likes", as: :adding_likes
get "add_accept/(:answer_id)", to: "answers#accept", as: :accept
get "leaderboard", to: "users#leaderboard", as: :leaderboard
end
My controller:
class OmniauthCallbacksController < Devise::OmniauthCallbacksController
def all
raise request.env["omniauth.auth"].to_yaml
end
alias_method :github, :all
end
My user model:
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable, :omniauthable
# :recoverable, :rememberable and :trackable
devise :database_authenticatable, :registerable, :validatable, :omniauthable
has_attached_file :avatar, :styles => { :small => "100x100>" }
validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
# has_attached_file :superstarbadge, :styles => { :small => "100x100>" }
# validates_attachment_content_type :superstarbadge, :content_type => /\Aimage\/.*\Z/
has_many :questions
has_many :answers
def to_s
email
end
end
Important part of my devise.rb
config.omniauth :github,NOT-VISIBILE,IN-HERE

Answer 1

Basically, you haven't added the routes for it. I think you've missed Ryan add it to his routes file. Just add this:
get "/auth/github/callback" => "yourController#yourAction"
but since you're using omniauth, it's better this way
get "/auth/:provider/callback" => "yourController#yourAction
And add the necessary views for it.