опа

gistfile1.rb

# Concern
module SkipSpecificCallback
  extend ActiveSupport::Concern

  module ClassMethods

    def with_skip(callback_name, *args)
      options = args.extract_options! 
      raise Exception, ":on not specified" if options[:on].blank?
      attribute_name = "skip_#{callback_name}"

      send(:class_attribute, attribute_name)

      send options[:on] do |record|
        unless record.send(attribute_name)
          record.send(callback_name)
        end
      end
    end

  end

end

# class
class A < ActiveRecord::Base
  include SkipSpecificCallback
  
  with_skip :run_alert, :on => :after_create

  private
   
    def run_alert
      puts "alert"
    end
end

# runtime

a1 = A.new
a1.skip_run_alert = true
a1.create # => nil

a2 = A.new
a2.skip_run_alert = false
a2.create # => "alert"

# можно хуйнуть прямо для всех объектов ;)
A.skip_run_alert = true
a3 = A.new
a3.create # => nil