Observer

gistfile1.rb

class UserObserver < ActiveRecord::Observer
  include OverAchievement

  level_up :foobar, on: [:after_save, :before_create] do
    if user.is_active?
  end
  
end

Module

module OverAchievement

  def level_up(level, *args, &block)
    options = args.extract_options!
    options[:on] = options[:on].to_a
  
    options[:on].each do |callback|
      defined_levels[callback] ||= []
      defined_levels[callback] << block
    end
  
    def defined_levels
      @defined_levels ||= {}
    end

  end

end