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The next step in processing a sales order is to create an invoice. Invoices can be created from the order details page (shown previously in Figure 4-5). Invoicing is a great way to notify customers that they still have an outstanding balance that needs to be paid. This is especially helpful if customers have the option to pay by check, money order, or purchase orders. You can also create multiple invoices per sales order. For example, if a customer orders two of product A and two of product B, you can invoice those two groups individually. Once an order has been invoiced, it will appear on the Invoices Grid. The Invoices Grid uses a very similar layout to the sales order grid. Invoices can be filtered and searched for using the provided fields (see Figure 4-7).

Once you ve created these lists, you can look up Cecil s telephone number as follows: >>> numbers[names.index('Cecil')] 3158 It works, but it s a bit impractical. What you really would want to do is something like the following: >>> phonebook['Cecil'] 3158 Guess what If phonebook is a dictionary, you can do just that.

Page caching is the fastest of the caching schemes in Rails. With page caching, the cached page is stored as a static HTML file in the document root of the web server and served directly from there on subsequent requests. This means that Rails can be bypassed altogether, and the web server can serve the page in the same way that it serves other static files. This obviously means a huge impact on the performance. Whereas a single Rails process can serve a few dozen noncached pages per second, a real web server serving static files can easily reach speeds of up to 1000 requests per second. Should all our actions then be using page caching Well, no. Page caching stores the output of an action in a file and serves that same file all the time, to all the people. This has many drawbacks. The page is not really dynamic anymore. You can t use authentication, since Rails is bypassed. You also can t have any personalization on the page. Therefore, page caching is not really recommended for anything but the most static pages served by a Rails application. Page caching is also kind of against the shared nothing architecture, since the cached pages are stored on the file system. You could use a networked file system that all the application servers would use as the document root, but you would still be vulnerable to different application servers trying to write the same file at the same time. However, we do have one page in the Emporium application that hardly ever changes: the About page. Let s implement page caching for it as an exercise.

Figure 4-7. This is a look at the invoice orders grid. Orders must be invoiced before they will appear on this list. If you click on any of the invoices you may be taken to the invoice detail page shown in Figure 4-8. At first glance, this might look identical to the sales order detail page, and while the information and layout is nearly identical it is important to understand that invoices cannot exists without a sales order being placed or created first.

For example, if you re running Debian Linux, you should be able to install Python with the following command: $ apt-get install python2.4 If you re running Gentoo Linux, you should be able to use Portage, like this: $ emerge python In both cases, $ is, of course, the bash prompt. Replace 2.4 with the most recent version number.