active_record_macros.rb

require 'active_record/connection_adapters/abstract/schema_definitions'

class ActiveRecord::ConnectionAdapters::TableDefinition

	def publishing(*args)
		options = args.extract_options!
		column(:publish_up, :datetime, options)
		column(:publish_down, :datetime, options)
	end
end

extend activerecord migration macro/DSL.

usage:

class CreateUsers < ActiveRecord::Migration
  def self.up
    create_table :users do |t|
      t.string :first_name
      t.string :last_name
      t.timestamps
      t.publishing #!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    end
  end

  def self.down
    drop_table :users
  end
end