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In this step, customers must enter in their Billing Information which includes name, company, email, mailing address, city, state, zip, country, and phone number. Customers can choose to ship to the same address and skip to step 4. If at any point the customers want to change this information they can go back to one of the previous steps by clicking one of the previous bars. After an Address is used for the first time, it will be associated with the customer s account and they will be able to select a previously used address from a drop down menu (see Figure 3-15).

Tip You can start WEBrick and your application in different environments by using the environment parameter: script/server -e test. For example, the following will start your application s test environment and WEBrick in daemon mode, listening on port 80: script/server -d -p 80 -e test

Figure 3-15. Step 2 of the onepage checkout process. Customers must enter in their billing information.

1. The term grok is hackerspeak, meaning to understand fully, taken from Robert A. Heinlein s novel Stranger in a Strange Land (Ace Books, reissue 1995).

Figure 1-1. The default Ruby on Rails Welcome page The code you see on the Welcome page is in the index.html file, which is located in the public directory under the application root. It was created by the rails command and should be deleted, so that it doesn t prevent the controller for the root context from being called: $ rm /home/george/projects/emporium/public/index.html You will get an error, Recognition failed for "/", if you access http://localhost:3000 again after deleting index.html. The error is thrown because there are no controller and action set up to handle the request. We are now ready to start writing some code. But first, we ll introduce you to how requests are handled by the Rails framework.

In step 3, customers must enter their shipping information. Similar to the billing information, this information will be accessible to the customer next time they start the checkout process (see Figure 3-16).

Tip If you like tab completion, you might want to check out the modules readline and rlcompleter in

Ruby on Rails is built around the Model-View-Controller (MVC) pattern. MVC is a design pattern used for separating an application s data model, user interface, and control logic into three separate layers with minimal dependencies on each other: The controller is the component that receives the request from the browser and performs the user-specified action. The model is the data layer that is used, usually from a controller, to read, insert, update, and delete data stored, for example, in a relational database. The view is the representation of the page that the users see in their browser; usually, the model is shown.

Figure 4-28. Google Sitemap provides a list of available sitemaps. Once you ve created a sitemap, you can click on the link for google categories and it will give you a preview of what the file looks like. It will contain page URLs, dates that the URLs were last modified, and how frequent the URLs are updated. If you re trying to set up a google site map and are unable to do so, it might be because cron is not enabled. To find out more about Magento s cron take a look at this forum thread and link to Magento s wiki: http://www.magentocommerce.com/boards/viewthread/13982/.

Tip See Wikipedia s entry on MVC if you want to learn more about this pattern: