002_add_price.rb

来自「ruby on rails web敏捷开发之路第二版 源代码」· RB 代码 · 共 15 行

#---
# Excerpted from "Agile Web Development with Rails, 2nd Ed."
# We make no guarantees that this code is fit for any purpose. 
# Visit http://www.pragmaticprogrammer.com/titles/rails2 for more book information.
#---
class AddPrice < ActiveRecord::Migration
  def self.up
    add_column :products, :price, :decimal, :precision => 8, :scale => 2, :default => 0
  end

  def self.down
    remove_column :products, :price
  end
end