product.rb

来自「ruby on rails web敏捷开发之路第二版 源代码」· RB 代码 · 共 31 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 Product < ActiveRecord::Base
  
  def self.find_products_for_sale
    find(:all, :order => "title")
  end
  
  # validation stuff...


  validates_presence_of :title, :description, :image_url
  validates_numericality_of :price
  validates_uniqueness_of :title
  validates_format_of :image_url, 
                      :with    => %r{\.(gif|jpg|png)$}i,
                      :message => "must be a URL for a GIF, JPG, or PNG image"
  protected

  def validate
    errors.add(:price, "should be at least 0.01") if price.nil? ||  price < 0.01
  end

end