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and algorithms. Instead, you should refactor your view code and move the complex logic to a helper class. The methods in this class are automatically made available to the view. Using helpers will make your code easier to read and more maintainable.

The remove method is used to remove the first occurrence of a value: >>> x = ['to', 'be', 'or', 'not', 'to', 'be'] >>> x.remove('be') >>> x ['to', 'or', 'not', 'to', 'be'] >>> x.remove('bee') Traceback (innermost last): File "<pyshell#3>", line 1, in x.remove('bee') ValueError: list.remove(x): x not in list As you can see, only the first occurrence is removed, and you cannot remove something (in this case, the string 'bee') if it isn t in the list to begin with. It s important to note that this is one of the nonreturning in-place changing methods. It modifies the list, but returns nothing (as opposed to pop).

Adding new customers are not just unique to new orders, you can add new Customers to your store through the Administration Interface. To do this, navigate to Customers Manage Customers, then click the Add New Customer button in the upper-right hand corner. Once the create customer page loads it should look like Figure 6-3.

Next, we tell George to come over and have a look at the About page He asks us why the hell we have put the text Find me in app/views/about/indexrhtml on the page We explain to him that the page, or view as it is also called, was generated by Ruby on Rails, and that we can change it He scribbles down something on a paper, which looks like a foreign mailing address, and gives it to us A view is where you put the code for the presentation layer that generates, for example, HTML or XML Views are written in a template language called Embedded Ruby (ERB), which allows you to write Ruby code directly in the view Here is an example of a view written in ERB that prints out the text This is embedded Ruby code to the browser.

Figure 6-3. Creating a new customer from the administration interface Creating a new customer is divided up into two sections, Account Information and Addresses. The first section, Account Information, includes several required information items that are denoted by the red asterisk. Customer accounts are unique to each web site, and while you can create the same customer for multiple web sites, each one of those accounts must be created separately. The second section, Addresses, contains address information for the new customer you are creating. While it s not required, if you have their billing and shipping information, it is recommended that when you create a new customer that you enter in this information. It will save the customer time during their checkout process. Customers can add new addresses during the checkout process or manage any of their addresses by clicking the My Account link in the header. Customers must be logged into the public interface to edit their account information.

The reverse method reverses the elements in the list. (Not very surprising, I guess.) >>> >>> >>> [3, x = [1, 2, 3] x.reverse() x 2, 1]

<%# This is a comment and is not shown to the user %> <% text = "This is embedded Ruby code" %> <%= text %> ERB code follows the syntax <% Ruby code %>, and <%= Ruby expression %> is used for printing out the value of an object to the browser Comments are formatted as <%# comment %> ERB also allows you to prevent HTML injection by escaping the following special characters in content entered by users: &, <, >, and " The following line outputs the text &<> to the browser, instead of &<>, by using the h method, which is short for html_escape <%= h('&<>') %> The view we are going to change is located in the app/views directory This is the root directory for all views Each view is stored in a subdirectory named after the controller.