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Let s review some of the most important concepts covered in this chapter: Sequences. A sequence is a data structure in which the elements are numbered (starting with zero). Examples of sequence types are lists, strings, and tuples. Of these, lists are mutable (you can change them), whereas tuples and strings are immutable (once they re created, they re fixed). Parts of a sequence can be accessed through slicing, supplying two indices, indicating the starting and ending position of the slice. To change a list, you assign new values to its positions, or use assignment to overwrite entire slices. Membership. Whether a value can be found in a sequence (or other container) is checked with the operator in. Using in with strings is a special case it will let you look for substrings. Methods. Some of the built-in types (such as lists and strings, but not tuples) have many useful methods attached to them. These are a bit like functions, except that they are tied closely to a specific value. Methods are an important aspect of object-oriented programming, which we look at later, in 7.

Order History stores comments and changes to order status and is viewable by customers This is an optional area Order Totals: Before you submit an order there are two additional checkboxes If you added a comment to the order, make sure you select the Append Comments checkbox You also have the ability to send the customer an email containing all order information by selecting the Email Order Confirmation checkbox..

outside your application directory (for example, /u/apps/emporium/shared). This is because Capistrano deploys your application to a different directory each time you perform a deployment. If the index were in the application directory, Ferret wouldn t be able to find it, and would create a new, empty one. One option is to put the indices in shared/index, and create an after_deploy hook that creates a symlink from current/index to shared/index.

Once you submit an order, you will be taken to the order details page. This page allows you to review and manipulate orders on an individual basis. Alternatively, you can reach this page by clicking on any order on the sales grid page (see Figure 4-6).

cmp(x, y) len(seq) list(seq) max(args) min(args) reversed(seq) sorted(seq) tuple(seq)

Capistrano also has a built-in task that you can use for running database migrations during deployment on the remote machine. This means that you don t need to create the database schema yourself, as you do when you deploy your application manually. Use the following command to run migrations along with the deployment: $ rake remote:deploy_with_migrations This checks out the latest version of the source on the remote machine. After the checkout has completed, rake runs the migrations, which create the Emporium database.

details page. This is also a good place to keep comments for internal use that the customer might not need to be apprised of.

The last step we need to perform is to start up LightTPD, which acts as a reverse proxy for the FastCGI processes. Again, we ll create a new task in our deployment recipe to save us the trouble of having to manually log in to the remote server(s) and execute the command each time we want to start the web server. Add the following task to the deployment recipe (config/deploy.rb): task :start_lighttpd, :roles => 'web' do sudo "lighttpd -f /u/apps/emporium/current/config/lighttpd-production.conf" end Notice that we have told Capistrano to run the task only on servers having the web role. Next, run the task by executing the following command: $ cap -a start_lighttpd loading configuration /usr/lib/ruby/gems/1.8/gems/capistrano- 1.1.0/lib/capistrano/recipes/standard.rb loading configuration ./config/deploy.rb * executing task start_lighttpd * executing "sudo lighttpd -f /u/apps/emporium/current/config/lighttpd-production.conf" servers: ["192.168.0.1"] Password: [192.168.0.1] executing command command finished

Compares two values Returns the length of a sequence Converts a sequence to a list Returns the maximum of a sequence or set of arguments Returns the minimum of a sequence or set of arguments Lets you iterate over a sequence in reverse Returns a sorted list of the elements of seq Converts a sequence to a tuple

That wraps it up for working with customers. We reviewed how to import customers, manually create customers, and view existing customers. In 7, you will walk through each status in which an order can be placed. During each of these transitions, you have the ability to notify the customer of the changes that have been made to their order.

Tip You should need to start LightTPD web server only once. Rebooting the machine will, of course, kill your processes, so remember to create a start script that runs at reboot and that starts LightTPD and the spawner process.