#361 Facebook Graph API pro

Jun 25, 2012 | 14 minutes | Tools, Plugins, Authentication

Learn how to use the Facebook Graph API with the Koala gem to fetch data from Facebook and post content through a user. Here I delve into permissions, error handling, and more.

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Resources

          models/user.rb
        
def facebook
  @facebook ||= Koala::Facebook::API.new(oauth_token)
  block_given? ? yield(@facebook) : @facebook
rescue Koala::Facebook::APIError => e
  logger.info e.to_s
  nil # or consider a custom null object
end

def friends_count
  facebook { |fb| fb.get_connection("me", "friends").size }
end

          rails console
        
u = User.first
u.facebook.get_object("me")
u.facebook.get_connection("me", "television")
u.facebook.get_object("22934684677")
u.facebook.get_object("TheBigBangTheory")
u.facebook.put_wall_post("testing")
u.facebook.get_connection("me", "permissions")

u = User.last
u.facebook.get_connection("me", "permissions")
u.facebook.put_wall_post("testing")
u.facebook.fql_query("select pic from page where username='amazon' or username='google'")

          config/initializers/omniauth.rb
        
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_SECRET'], scope: "email,publish_stream"
end

          app/assets/javascripts/facebook.js.coffee.erb
        
if $('#sign_out').length > 0
  FB.getLoginStatus (response) ->
    window.location = $('#sign_out').attr("href") if !response.authResponse