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Let s start with CheckoutController (in app/controllers/checkout_controller.rb): def place_order @page_title = "Checkout" @order = Order.new(params[:order]) @order.customer_ip = request.remote_ip populate_order if @order.save if @order.process flash[:notice] = 'Your order has been submitted, and will be processed immediately.' session[:order_id] = @order.id # Empty the cart @cart.cart_items.destroy_all expire_fragment(:controller => "cart", :action => "show", :id => cart) redirect_to :action => 'thank_you' else flash[:notice] = "Error while placing order.'#{@order.error_message}'" render :action => 'index' end else render :action => 'index' end end Now whenever an order is processed and the shopping cart is cleared, the cached cart fragment is expired. For CartController, we use a different approach a cache sweeper. A cache sweeper is a special kind of an observer. It observes the lifeline of an object and can sweep cached stuff when specific changes (such as create, update, or destroy) are made to the object in question. Create a file called cart_sweeper.rb in app/models and add the following code to it: class CartSweeper < ActionController::Caching::Sweeper observe Cart, CartItem def after_save(record) cart = record.is_a (Cart) record : record.cart expire_fragment(:controller => "cart", :action => "show", :id => @cart) end end You can see that the sweeper looks just about the same as a normal observer. In this case, we observe both the Cart object and the CartItem objects that belong to it. When either kind

Note When you create a shipment for an order, this will change the order status from PROCESSING to

of object is saved, we find the relevant Cart object and expire the fragment that belongs to that cart. To make the sweeper work, we need to call it in CartController (app/controllers/ cart_controller.rb): class CartController < ApplicationController cache_sweeper :cart_sweeper before_filter :initialize_cart ... That s all. Since we want the sweeper to work on all the actions in CartController, we don t have to specify anything else. If we wanted to restrict the sweeper to only certain actions, we could use the :only parameter for that.

language. Two distributions that take a different approach are Jython and IronPython. If you re interested in other development environments than IDLE, Table 1-1 lists some options.

COMPLETE. If an invoice for the order has not been created, a PENDING status will be changed to PROCESSING when you create a shipment order.

Page caching results are always stored in the file system. Fragment caching has a few more options: File store: The contents of the cache are stored in the file system, just as in page caching. Memory store: All the cached fragments are stored in memory. This is the fastest option of all, but it doesn t scale beyond one application server process, since each process keeps its own cache. DRb store: Cached fragments are kept in the memory of a shared DRb (Distributed Ruby) process. This option scales, but it requires you to build and maintain the process yourself. Memcache store: Fragments are stored in a memcached process. Is very fast and scales well, since memcached can be accessed through the network. The fragment store that is being used can be chosen either on the application (in config/ environment.rb) or environment level (for example, in config/environments/production.rb) by setting the fragment_cache_store parameter: ActionController::Base.fragment_cache_store = :mem_cache_store, "localhost"

IDLE Pythonwin ActivePython Komodo Wingware BlackAdder Boa Constructor Anjuta ArachnoPython Code Crusader Code Forge Eclipse eric KDevelop VisualWx wxDesigner wxGlade

Credit Memos are used to provide customers with refunds. Credit memos can be issued at any part in the process once an order has been placed. To create a credit memo, you must visit a sales order detail page. Credit memos allow you to either credit entire orders back to customers or select specific product quantities to refund to the customer. You can also fund a portion of the shipping price (see Figure 4-11).