devise_oauth2_facebook

Only Rails 3 is supported.

Uses fbgraph (http://github.com/nsanta/fbgraph) Could use the Oauth2 gem directly, but it is more than likely that you would want to use other features of facebook (ie post feed updates).

How to use

Setup devise (http://github.com/plataformatec/devise), use Rails 3

Include the gem in Gemfile after devise: gem 'devise' gem 'devise_oauth2_facebook'

Include the ':devise_oauth2_facebook' in your model:

devise :database_authenticatable, :registerable, :confirmable, :recoverable, :rememberable, :trackable, :validatable, :devise_oauth2_facebook

Add the following config options:

$ config/initializers/devise.rb

config.facebook_api_key = "KEY" config.facebook_api_secret = "SECRET" config.facebook_permissions = 'offline_access,email,publish_stream'

Good minimum to have is "offline_access,email"

Create a migration file to add the columns:

add_column :users, :facebook_uid, :string add_column :users, :facebook_token, :string

Finally, update your view to include "Login with facebook" link: <%= link_to "Login with facebook", user_fb_auth_path %>