Railscast #236 extension with Fb_graph and Twitter

user.rb

# app/models/user.rb

def apply_omniauth(omniauth)
  case omniauth['provider']
  when 'facebook'
    self.apply_facebook(omniauth)
  when 'twitter'
    self.apply_twitter(omniauth)
  end
  authentications.build(hash_from_omniauth(omniauth))
end

def facebook
  @fb_user ||= FbGraph::User.me(self.authentications.find_by_provider('facebook').token)
end

def twitter
  unless @twitter_user
    provider = self.authentications.find_by_provider('twitter')
    @twitter_user = Twitter::Client.new(:oauth_token => provider.token, :oauth_token_secret => provider.secret) rescue nil
  end
  @twitter_user
end


protected

def apply_facebook(omniauth)
  if (extra = omniauth['extra']['user_hash'] rescue false)
    self.email = (extra['email'] rescue '')
  end
end

def apply_twitter(omniauth)
  if (extra = omniauth['extra']['user_hash'] rescue false)
    # Example fetching extra data. Needs migration to User model:
    # self.firstname = (extra['name'] rescue '')
  end
end

def hash_from_omniauth(omniauth)
  {
    :provider => omniauth['provider'], 
    :uid => omniauth['uid'], 
    :token => (omniauth['credentials']['token'] rescue nil),
    :secret => (omniauth['credentials']['secret'] rescue nil)
  }
end