product.rb

用NETBEANS编的

# Copyright (c) 2006 The Pragmatic Programmers, LLC.
# Reproduced from the book "Agile Web Development with Rails, 2nd Ed.",
# published by The Pragmatic Bookshelf.
# Available from www.pragmaticprogrammer.com/titles/rails2
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this source code (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# 1) This Software cannot be used in any training course or seminar, whether
# presented live, via video, audio, screencast, or any other media, without
# explicit prior permission from the publisher.
# 
# 2) The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE. 

# Schema as of June 12, 2006 15:45 (schema version 7)
#
# Table name: products
#
#  id          :integer(11)   not null, primary key
#  title       :string(255)   
#  description :text          
#  image_url   :string(255)   
#  price       :integer(11)   default(0)
#

#START:has_many
class Product < ActiveRecord::Base

  has_many :orders, :through => :line_items
#END:has_many
  has_many :line_items
  
  def self.find_products_for_sale
    find(:all, :order => "title")
  end
  

  #START:validation
  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:validation
#START:has_many
end
#END:has_many