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CHAPTER 7 TAGGING SUPPORT
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This simply loops through all the books and links to the book details page we implemented in 4. Now you can do a quick test by accessing http://localhost:3000/tag/list. You should see a list of tags, as shown in Figure 7-5.
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Figure 7-5. The tag list page showing a list of tags If you click a tag, you should see all books that have been tagged with that specific tag, as shown in Figure 7-6. Clicking the book title takes you to the book details page.
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Figure 7-6. The show tag page
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CHAPTER 7 TAGGING SUPPORT
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We still don t have a link to either the tag list or the show tag page. It would be natural to link to the show tag page from all the places where the tag is being displayed. Luckily, we used a helper to display the list of tags that have been assigned to a book, so the change is just in one place. Change the display_tags method in app/helpers/application_helper.rb as follows: def display_tags(book) book.tags.collect{|tag| link_to tag.name, :controller => '/tag', :action => 'show', :id => tag.name }.join(", ") if book.tags end Instead of just showing the tag s name, we now link to the show tag page.
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Note Notice that we needed to prepend a forward slash to the controller, so that the admin pages
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also point to the correct page. If we had used only :controller => 'tag', the generated URL would be /admin/tag/show/x.
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Now, if you access any of the pages where we display a book and the tags, the tags should be clickable and point to the show tag page. A good place for putting a link to the tag list page would be the menu. To do this, add the following code to application.rhtml: <li><a <li><a <li><a <li><a href="/admin/book">Books</a> | </li> href="/tag/list">Tags</a> | </li> href="/">Catalog</a> | </li> href="/about">About</a> </li>
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Implementing the Recommend Books User Story
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Recall that the Recommend Books user story describes how George wants to be able to automatically recommend related books to customers. The acts_as_taggable gem has two methods that we can use for implementing this functionality: book.tagged_related: We can use this instance method to display books that share one or more of the same tags, and that are related to the current book being displayed to the customer. Book.find_related_tags: We can use this class method to recommend books that use tags that are related to the tags used by the currently displayed book.
CHAPTER 7 TAGGING SUPPORT
Open app/views/catalog/show.rhtml in your editor and add the following code to it: <dl> <dt>Price</dt> <dd>$<%= sprintf("%0.2f", @book.price) -%></dd> <dt>Page count</dt> <dd><%= @book.page_count -%></dd> <dt>Tags</dt> <dd><%= display_tags @book -%></dd> </dl> <% if @book.tags.size > 0 %> <div id="recommended"> <h2>Recommendations</h2> <h4>Books</h4> <% for book in @book.tagged_related %> <%= link_to book.title, :action => 'show', :id => book.id %><br/> <% end %> <h4>Tags</h4> <% for tag in Book.find_related_tags(@book.tags.collect(&:name), :separator => ',', :raw => true, :limit => 100) %> <%= link_to tag['name'], :controller => 'tag', :action => 'show', :id => tag['name'] %><br/> <% end %> </div> <% end %> We now show the tags on the page. We also added a div that is used to recommend similar books and tags to the customer. This div uses the id recommended, so that we can style it with CSS. We want it to be displayed as a sidebar to the right of the page. We do this by adding the following to public/stylesheets/style.css: #recommended { border-left: 3px solid #666; background-color: white; position: fixed; bottom: 0; right: 0; width: 200px; height: 100%; padding: 5px 10px; }
CHAPTER 7 TAGGING SUPPORT
Note that the recommendations are done with the acts_as_taggable API. Now add three new books with tags, as follows: For the first book, add the tags Ruby, Ruby on Rails, Programming. For the second book, add the tags Ruby, Programming. For the third book, add the tags Ruby, Ruby on Rails, Programming, E-Commerce. You should see something similar to Figure 7-7 when accessing the second book. The system automatically recommends the first and third book, and the Ruby on Rails and E-Commerce tags to the customer.
Figure 7-7. The book details page displaying recommendations in the sidebar Related books are pulled out of the database by calling book.tagged_related, which returns an array of books. Related tags are displayed with the code shown here: <% for tag in Book.find_related_tags(@book.tags.collect(&:name), :separator => ',', :raw => true) %> <%= link_to tag['name'], :controller => 'tag', :action => 'show', :id => tag['name'] %><br/> <% end %> We specify three parameters for the Book.find_related_tags method: @book.tags.collect(&:name): This is shorthand notation for @book.tags.collect(|tag| tag.name), and returns an array of tag names. :separator => ',': We specify that the separator is a comma. :raw => true: We specify that we want an array of hashes returned, so that we can use tag['name'] instead of tag[0], to access the tag names.
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