require 'active_support/concern' require 'active_support/ordered_options' require 'active_support/core_ext/kernel/singleton_class' require 'active_support/core_ext/module/delegation' module ActiveSupport # Configurable provides a config method to store and retrieve # configuration options as an OrderedHash. module Configurable extend ActiveSupport::Concern class Configuration < ActiveSupport::InheritableOptions def compile_methods! self.class.compile_methods!(keys.reject {|key| respond_to?(key)}) end # compiles reader methods so we don't have to go through method_missing def self.compile_methods!(keys) keys.each do |key| class_eval <<-RUBY, __FILE__, __LINE__ + 1 def #{key}; _get(#{key.inspect}); end RUBY end end end module ClassMethods def config @_config ||= if superclass.respond_to?(:config) superclass.config.inheritable_copy else # create a new "anonymous" class that will host the compiled reader methods Class.new(Configuration).new end end def configure yield config end def config_accessor(*names) names.each do |name| code, line = <<-RUBY, __LINE__ + 1 def #{name}; config.#{name}; end def #{name}=(value); config.#{name} = value; end RUBY singleton_class.class_eval code, __FILE__, line class_eval code, __FILE__, line end end end # Reads and writes attributes from a configuration OrderedHash. # # require 'active_support/configurable' # # class User # include ActiveSupport::Configurable # end # # user = User.new # # user.config.allowed_access = true # user.config.level = 1 # # user.config.allowed_access # => true # user.config.level # => 1 # def config @_config ||= self.class.config.inheritable_copy end end end