gistfile1.txt

require "awesome_print"


module Config
  def self.config
    @config ||= {}
  end

  # this allows classes which include this module to access config
  def config
    Config.config
  end

  # this allows callers to use Class.config to access config
  def self.included(klass)
    klass.extend Config
  end
end

class App
  include Config

  # exposing config method as instance method
  def get_config
    # accessing the Config singleton directly
    Config.config[:blah] = "foo"

    # accessing via mixin
    config
  end

  # changing Config module singleton class variable value
  def change_config
    config[:changed] = true
  end

  # example of doing something with the apps config from a sub module
  def sub_module_method
    SubModule.test
  end

  module SubModule
    def self.test
      App.config
    end
  end
end

a = App.new
b = App.new

ap a.get_config
a.change_config
ap b.get_config

ap a.sub_module_method