because singletons are bad

gistfile1.rb

# before

class X
  # imperative, affects system state, depends on globals
  def self.x
    puts Config.data
  end
end

X.x

# after
require 'active_support/core_ext'

class X
  # make data local
  def initialize(data = Config.data)
    @data = data
  end
  
  # use local data
  def x
    puts @data
  end
  
  # temporary shim to support old code invocations
  class << self
    delegate :x, :to => :new
  end
end

X.new.x