You've got a lot of Gal

Yet another blog about Ruby, Rails, Javascript, Apple, Malteses and Shih-Tzus by Gal Steinitz

This site is completely static. It was last generated with Octopress and Jekyll on Sep 02, 2013 and hosted on github pages.

Absolutely Dead Simple Login System for Rails With Omniauth and Facebook

In 6 steps…

1) Add omniauth-facebook to your gemfile

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gem 'omniauth-facebook'

2) Add routes for login and logout

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match '/auth/facebook/callback' => 'session#create'
match '/auth/logout' => 'session#destroy'

3) Create the sessions controller

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class SessionController < ApplicationController

  def create
    session[:current_user] = {:name => request.env['omniauth.auth'][:info][:name]}
    redirect_to root_path
  end

  def destroy
    session.delete(:current_user)
    redirect_to root_path
  end
end

4) Add some links to your layout

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<% if current_user %>
  Logged in as <%=current_user[:name]%>
  <%= link_to 'logout','/auth/logout' %>
<% else %>
  <%= link_to 'login with facebook','/auth/facebook' %>
<% end %>

5) Add a helper to your application controller

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class ApplicationController < ActionController::Base

  helper_method :current_user

  private

  def current_user
    session[:current_user]
  end
end

6) Add your facebook app keys in config/initializers/omniauth.rb, replacing <api key> and <api secret> with your actual keys:

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Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, '<api key>', '<api secret>'
end

Thats it!

You can replace omniauth-facebook with any other provider (such as omniauth-twitter) and it will work just as well.

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