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Next, change the edit action in app/controllers/admin/book_controller.rb as follows: def update @book = Book.find(params[:id]) @book.tag(params[:tags], :separator => ',', :clear => true) if @book.update_attributes(params[:book]) flash[:notice] = 'Book was successfully updated.' By setting the :clear parameter to true, we first empty the collection of tags, before assigning the new one. Run the integration tests with ruby test/integration/book_test.rb. This time, all tests should pass without errors.

On the category landing pages, you can display your products in both grid and list type layouts. Customers have the ability to change their view, as well as sorting options for the number of products shown and how they are sorted. Products can be sorted by position, name, price, and quantity ratio (see Figure 3-6).

We have finished the implementation of this user story. Now, we need to check that it works by editing an existing book that has been assigned some tags. Add or remove a tag and verify the results. Notice that there s one small problem we should fix before moving on to the next user story: the book details and book list pages should display the tags to the administrator. Start by changing the book list view. Open app/views/admin/book/list.rhtml in your editor and modify the existing code as shown here: <tr> <th><a href=" sort_by=publisher_id">Publisher</a></th> <th><a href=" sort_by=title">Title</a></th> <th>Tags</th> <th><a href=" sort_by=isbn">ISBN</a></th> <th colspan="3"></th> </tr> <% for book <tr> <td><%= <td><%= <td><%= <td><%= <td><%= in @books %> book.publisher.name %></td> link_to book.title, :action => 'show', :id => book %></td> display_tags book %></td> book.isbn %></td> link_to 'Show', :action => 'show', :id => book %></td>

ou now know most of the basic Python language. While the core language is powerful in itself, Python gives you more tools to play with. A standard installation includes a set of modules called the standard library. You have already seen some of them (math and cmath, containing mathematical functions for real and complex numbers, for example), but there are many more. This chapter shows you a bit about how modules work, and how to explore them and learn what they have to offer. Then the chapter offers an overview of the standard library focusing on a few selected useful modules.

Figure 3-6. Shows the two different layouts in which products can be displayed, grid and list style layouts. This allows for complete flexibilty as customers are browsing your site.

Notice that we have introduced a new helper method called display_tags, because we need to display the tags on both pages. Instead of duplicating the code in the view, we add the following method to the application helper (app/helpers/application_helper.rb): def display_tags(book) book.tags.collect{|tag| tag.name }.join(", ") if book.tags end By adding the new method to the application helper, we can now access it from any view in our application. After making the change, access http://localhost:3000/admin/book/list. You should now see the tags displayed in the list, as shown in Figure 7-3.

Customers can also control how products are displayed by selecting the filter options on the lefthand side of the screen. Display options are listed under the SHOP BY title. Filter options can include price, color, and manufacturer. To apply these filters, simply click on one of the links. Customers can apply multiple filters to category listings. To remove these filters, simply press the clear all items option (see Figure 3-7).

You already know about making your own programs (or scripts) and executing them. You have also seen how you can fetch functions into your programs from external modules using import: >>> import math >>> math.sin(0) 0.0 Let s take a look at how you can write your own modules.

Figure 7-3. The book list page showing the Tags column Next, change the book details view file. Open app/views/admin/book/show.rhtml and add the following after the Title field: <dt>Tags</dt> <dd><%= display_tags @book %></dd> Now, when you access the book details page, you should see the tags on the screen, as shown in Figure 7-4.