store_controller.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. 

class StoreController < ApplicationController
  
  #START:before_filter
  before_filter :find_cart, :except => :empty_cart
  #END:before_filter
  
  def index
    @products = Product.find_products_for_sale
  end


  def add_to_cart
    begin                     
      product = Product.find(params[:id])  
    rescue ActiveRecord::RecordNotFound
      logger.error("Attempt to access invalid product #{params[:id]}")
      redirect_to_index("Invalid product")
    else
      @current_item = @cart.add_product(product)
      redirect_to_index unless request.xhr?
    end
  end

  def empty_cart
    session[:cart] = nil
    redirect_to_index
  end

  #START:checkout
  def checkout
    if @cart.items.empty?
      redirect_to_index("Your cart is empty")
    else
      @order = Order.new
    end
  end
  #END:checkout
  
  #START:save_order
  def save_order
    @order = Order.new(params[:order])  
    @order.add_line_items_from_cart(@cart)
    if @order.save        
      session[:cart] = nil
      redirect_to_index("Thank you for your order")
    else
      render :action => :checkout
    end
  end
  #END:save_order
  private
  
  def redirect_to_index(msg = nil)
    flash[:notice] = msg if msg
    redirect_to :action => :index
  end
    
  #START:find_cart
  def find_cart
    @cart = (session[:cart] ||= Cart.new)
  end
  #END:find_cart<
end