require 'active_support'

class Playmo
  module Callbacks
    def self.included(base)
      base.class_eval do
        include ActiveSupport::Callbacks
        alias :fire :run_callbacks
      end
    end

    def method_missing(m, *args, &block)
      raise NoMethodError unless [:before, :after].include?(m)
      event = args.first

      class_eval do
        define_callbacks(event) unless respond_to? "_#{event}_callbacks"

        set_callback event, m do
          block.call
        end
      end
    end
  end

  include Callbacks

  def save
    before :save do
      puts "before_save block is called"
    end

    after :save do
      puts "after_save block is called"
    end

    fire :save do
      puts 'save'
    end
  end
end

Playmo.new.save