Less hacky options hash

Optionize.rb

module Optionize
  class AlreadyDefinedError < StandardError; end
  
  def self.included( base )
    base.extend ClassMethods
  end
  
  module ClassMethods
    def optionize( key, opts={} )
      getter = key
      setter = "#{key}="
      
      if method_defined?( getter ) || method_defined?( setter )
        raise AlreadyDefinedError
      end
      
      # Getter
      
      define_method getter do
        result = self.options[ key ]
        result ||= opts[ :default ]
        result = result.send( opts[:get] ) if opts[:get]
        result
      end
      
      # Setter
      
      define_method setter do |value|
        value = value.send( opts[:set] ) if opts[:set]
        self.options = self.options.merge key => value
      end
    end
  end
end

class Job
  attr_accessor :options
  
  include Optionize
  
  optionize :tyson_is_rad, :default => 10, :get => :to_i, :set => :to_s
  
  def options
    @options ||= {}
  end
end

j = Job.new
p "default = #{j.tyson_is_rad}"
j.tyson_is_rad = "123"
p "after set = #{j.tyson_is_rad}"