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Install and use

1. Install the facebooker gem and make Rails use it

$ sudo gem install facebooker

Make sure that you have setup you config/facebooker.yml to match your facebook application, make you application depended on the facebooker gem

config.gem "facebooker"

and run the xd_receiver generator to create the cross domain scripting bridge to make it possible for your application to communicate with facebook

$ script/generate xd_receiver

For more information on the facebooker gem checkout it's readme github.com/mmangino/facebooker/tree/master

2. Install the Authlogic Facebook Connect plugin

$ script/plugin install git://github.com/kalasjocke/authlogic_facebook_connect.git

This plugin should soon be packed inside a gem.

3. Make some changes to your database

class AddFacebookConnectFieldsToUser < ActiveRecord::Migration
  def self.up
    add_column :users, :name, :string
    add_column :users, :facebook_uid, :integer, :limit => 8
  end

  def self.down
    remove_column :users, :facebook_uid
    remove_column :users, :name
  end
end

4. Make your layout look something like this

The important parts are the facebook html namespace, facebook javascript include and the facebook helper calls to init the facebooker gem.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
  <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
  <title>Your awsome facebook connected app</title>

  <%= stylesheet_link_tag 'application' %>
  <%= javascript_include_tag :defaults %>

  <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php" type="text/javascript"></script>
</head>
<body>

<p style="color: green"><%= flash[:notice] %></p>

<%= fb_connect_javascript_tag %>
<%= init_fb_connect "XFBML" %>

<%= yield %>

</body>
</html>

5. Add the Facebook Connect button to your login form

<%= authlogic_facebook_login_button %>

Notes

If you want to save some user data when connecting to facebook you can use the before_connect hook in your user model.

def before_connect(facebook_session)
  self.name = facebook_session.user.name
end

For more information about what you can get form the facebook_session checkout the Facebooker gem rdoc.

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