Example options methods for polymorphic options model

gistfile1.txt

module ActiveRecordAddons
  def has_options
    class_eval do
      has_many :raw_options, :as => :owner, :class_name => "Option"

      def options
        opts = {}
        raw_options.each { |opt| opts[opt.key.to_sym] = converter(opt.value) }
        opts
      end

      def add_options opts
        opts.map do |key, value|
          raw_options.create! :key => key, :value => value
        end
      end

      def options= opts
        raw_options.each { |opt| opt.destroy }
        add_options opts
      end

    private
      def converter val
        Integer(val)
        rescue ArgumentError
          Float(val)
        rescue ArgumentError
          val
      end
    end
  end
end
ActiveRecord::Base.extend ActiveRecordAddons