Simple Facebook Connect
This plugin adds the ability to sign in/sign up using facebook connect to your Rails application.
Most of the code here is a direct rip-off of the facebooker gem. We wanted something much simpler than facebooker so we took the code we needed, refactored and changed bits and pieces and here we are.
With this plugin you will add the well know facebook connect button to your site. When a visitor clicks on it:
- she will be redirected to facebook
- after signing in at facebook be directed back to your signup page
- there she will sign up as usual but without being asked to enter a password
- after signing up she will be able to sign into your site by clicking the facebook connect button
When an existing user of your site clicks the button he will also be able to log in via facebook, given the email address he signed up with at your site is also known to facebook.
Set up a facebook application
For basic application setup see the facebook developer documentation.
This plugin assumes you have a
User model with an
User model and controllers in order to provide the necessary hooks and calls for facebook to authenticate your users.
Install the gem:
sudo gem install simple_facebook_connect --source=http://gemcutter.org
Add it as a dependency to your Rails application:
# environment.rb gem 'simple_facebook_connect', :source => 'http://gemcutter.org'
Run the migration generator and migrate:
script/generate simple_facebook_connect_migration rake db:migrate rake db:test:clone
In the meantime we have created a RAILS_ROOT/config/simple_facebook_connect.yml file in which you should enter your facebook API and secret keys.
After that add the facebook connect button to your sign up and/or sign in pages. We have prepared a partial for you:
<%= render :partial => 'shared/facebook_connect_button' %>
Add this to your signup action (
users/create in most cases):
class UsersController < ApplicationController def create @user = # initialize user .... @user.fb_uid = facebook_user.uid if facebook_user @user.save end end
Change your signup form to not show any password fields when signing up via facebook:
<%- unless facebook_user -%> <%= f.password_field :password -%> ... <%- end -%>
log_in(user) method, either in your
ApplicationController or by subclassing
class AppicationController < ActionController::Base ... private def log_in(user) session[:user_id] = user.id # or whatever your app does redirect_to account_path end end
User model Facebook aware:
class User facebook_user ... end
Optional step (well, you really should do this): Generate Cucumber Features:
This will generate a feature, step definitions and fixtures to test the facebook connect integration. You will probably have to adjust those files to fit your app, for example we are using Machinist to generate
Finally: run the features and by now everything should be green. Congrats.
You can grab some of the facebook profile data (e.g. name, location, picture) when signing up your new users. For a complete list of attributes see
SimpleFacebookConnect::User::FIELDS. In order to do that you could add a line of code to your signup action:
class UsersController < ApplicationController def create @user = # initialize user .... if facebook_user @user.name = facebook_user.name @user.about_me = facebook_user.about_me end @user.save end end
- facebooker: http://facebooker.rubyforge.org/
- contact: http://upstream-berlin.com
- email: alex [at] upstream-berlin dot com
Copyright (c) 2009 Alexander Lang, Frank Prößdorf, released under the MIT license