uninitialized constant ActiveSupport::Memoizable - ruby-on-rails

Question

Been trying to get fb_graph working so i can get things like someones friendlist and i cannot get rid of this error. The ActiveSupport::Memoizable is included in the facebook class. Trying figure it out from a fb_graph example application here https://github.com/nov/fb_graph_sample
image of error: http://imgur.com/VXSHhJf
facebook model:
class Facebook < ActiveRecord::Base
def profile
#profile ||= FbGraph::User.me(self.access_token).fetch
end
class << self
extend ActiveSupport::Memoizable
def config
#config ||= if ENV['fb_client_id'] && ENV['fb_client_secret'] && ENV['fb_scope']
{
:client_id => ENV['fb_client_id'],
:client_secret => ENV['fb_client_secret'],
:scope => ENV['fb_scope'],
}
else
YAML.load_file("#{Rails.root}/config/facebook.yml")[Rails.env].symbolize_keys
end
rescue Errno::ENOENT => e
raise StandardError.new("config/facebook.yml could not be loaded.")
end
def app
FbGraph::Application.new config[:client_id], :secret => config[:client_secret]
end
def auth(redirect_uri = nil)
FbGraph::Auth.new config[:client_id], config[:client_secret], :redirect_uri => redirect_uri
end
def identify(fb_user)
_fb_user_ = find_or_initialize_by_identifier(fb_user.identifier.try(:to_s))
_fb_user_.access_token = fb_user.access_token.access_token
_fb_user_.save!
_fb_user_
end
end
end
and here is facebooks_controller
require 'rack/oauth2'
class FacebooksController < ApplicationController
before_filter :require_authentication, :only => :destroy
rescue_from Rack:.center.hero-unit
%h1 Welcome to Dropshare
%h2
This is the home page for Dropshare
%p (at least for time being)
= render 'layouts/facebook_signup'
= render 'layouts/drive_signup'
/
<haml:loud> provide(:title, &#39;Home&#39;)</haml:loud>
<h1>Home</h1>
<p>This is the home page (for the time being) for Dropshare</p>
Sign up now!
:OAuth2::Client::Error, :with => :oauth2_error
# handle Facebook Auth Cookie generated by JavaScript SDK
def show
auth = Facebook.auth.from_cookie(cookies)
authenticate Facebook.identify(auth.user)
redirect_to dashboard_url
end
# handle Normal OAuth flow: start
def new
client = Facebook.auth(callback_facebook_url).client
redirect_to client.authorization_uri(
:scope => Facebook.config[:scope]
)
end
# handle Normal OAuth flow: callback
def create
client = Facebook.auth(callback_facebook_url).client
client.authorization_code = params[:code]
access_token = client.access_token! :client_auth_body
user = FbGraph::User.me(access_token).fetch
authenticate Facebook.identify(user)
redirect_to dashboard_url
end
def destroy
unauthenticate
redirect_to root_url
end
private
def oauth2_error(e)
flash[:error] = {
:title => e.response[:error][:type],
:message => e.response[:error][:message]
}
redirect_to root_url
end
end
Solution
replace
ActiveSupport::Memoizable
with memoist and require 'memoist'

Answer 1

I think you may be running into the fact that ActiveSupport::Memoizable was deprecated & removed from Rails.
https://github.com/rails/rails/commit/36253916b0b788d6ded56669d37c96ed05c92c5c
The author of that gem is running this version of Rails in their gemfile, so I would presume it's supported through this:
gem 'rails', '~>3.2.11'
I'm guessing you're running a newer version of Rails.