dsl_helper.rb

module AASM
  module DslHelper

    class Proxy
      attr_accessor :options

      def initialize(options, valid_keys, source)
        @valid_keys = valid_keys
        @source = source

        @options = options
      end

      def method_missing(name, *args, &block)
        if @valid_keys.include?(name)
          options[name] = Array(options[name])
          options[name] << block if block
          options[name] += Array(args)
        else
          @source.send name, *args, &block
        end
      end
    end

    def add_options_from_dsl(options, valid_keys, &block)
      proxy = Proxy.new(options, valid_keys, self)
      proxy.instance_eval(&block)
      proxy.options
    end

  end
end