class AddTimestamps < ActiveRecord::Migration def self.up add_column :items, :created_at, :datetime add_column :items, :updated_at, :datetime add_column :auctions, :created_at, :datetime add_column :auctions, :updated_at, :datetime end def self.down remove_column :items, :created_at remove_column :items, :updated_at remove_column :auctions, :created_at remove_column :auctions, :updated_at end end