Class configuration using OpenStruct

config_example_open_struct.rb

require 'ostruct'

module Awesome
  def self.config
    @config
  end

  def self.configure
    yield(config)
  end

  class Configuration < OpenStruct ; end

  @config = Configuration.new
end

Awesome.configure do |a|
  a.magic_number = 3
end

puts Awesome.config.magic_number
# => 3

puts Awesome.config
# => #<Awesome::Configuration magic_number=3>