Rake Task to set whether a user has been Facebook verified or not using Omniauth

facebook_verify.rb

    namespace :facebook do

      desc "Check if users have updated their Facebook verification status"
      task :update_user_verifiation_status => :environment do
        require 'omniauth'

        # get all users who are not currently verified
        @users = User.joins(:authentications, :profile).where(:"authentications.provider" => "facebook", :"user_profiles.facebook_verified" => 0).select("users.id AS id, authentications.uid, authentications.access_token, user_profiles.facebook_verified")
        @users.each do |user|
          FB = OmniAuth::Strategies::Facebook.new("nothing") 
          client = ::OAuth2::Client.new("nothing", "nothing", FB.client_options)
          cached_token = user.access_token
          access_token = ::OAuth2::AccessToken.new(client, cached_token)
          FB.instance_variable_set("@access_token", access_token)

          @auth_hash = FB.auth_hash rescue nil

          if @auth_hash
            user = User.find(user.id)
            user.profile.facebook_verified = !!@auth_hash['extra']['user_hash']['verified'] rescue false
            user.profile.save
          end

        end
      end

    end

TODO: re-write using libcurl and make use of FB's new Batching feature.