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Although the Add Items to the Cart user story is now fully functional, there is one thing George still wants us to implement: drag-and-drop shopping. Fortunately, with the functionality that is already in place, adding that capability is very easy. First, we need to make the books in the catalog pages draggable. Make the highlighted changes to app/views/catalog/_books.rhtml: <ul id="books"> <% for book in @books %> <li class="book" id="book_<%= book.id %>"> <dl> <dt><%= link_to book.title.t, :action => "show", :id => book %></dt> <% for author in book.authors %> <dd><%= author.last_name %>, <%= author.first_name %></dd> <% end %> <dd><%= pluralize(book.page_count, "page") %></dd> <dd>Price: $<%= sprintf("%.2f", book.price) %></dd> <dd><small><%= 'Publisher'.t %>: <%= book.publisher.name %></small></dd> <dd> <strong> <%= add_book_link("+", book) %> </strong> </dd> </dl> </li> <%= draggable_element("book_#{book.id}", :revert => true) %> <% end %> </ul> We changed the list to an unordered list and gave each book a list element of its own, so that it can be referenced uniquely by its id (for example, book_75). Then we made each book item a draggable element with the draggable_element method. Stating :revert => true in the call makes the item slide back to its original position when the mouse button is released during dragging. If you now reload the catalog page in a browser, you can drag the catalog items around the browser window. To make each item look more like an individual element, we need to style the list a bit. Add the following at the bottom of public/javascripts/style.css: #books { list-style: none; padding: 0; float: left; }

Look, Ma, No Arguments!

// Prepare the data $attribute_id = 'display_mode'; // using Zend XML-RPC method $result = $client->call('call', array($session_id, 'catalog_category_attribute.options', array($attribute_id))); // view the results var_dump($result);

#books .book { float: left; border: 4px solid #ccc; background-color: #fff; margin: 10px; padding: 5px; cursor: pointer; } The second part of implementing drag-and-drop functionality in a Rails application is to define an element as a drop-receiving element. This is done using the (surprise!) drop_receiving_element helper. In app/views/layouts/application.rhtml, add the following code after the shopping_cart element: <div id="shopping_cart"> <%= render :partial => "cart/cart" %> </div> <%= drop_receiving_element("shopping_cart", :url => { :controller => "cart", :action => "add" }) %> This makes the shopping_cart division act as a receiver for the dragged book items. Whenever a book is released over the shopping cart div, an Ajax call to the add action of CartController is made. You can test this by reloading the catalog page and dragging a book to the cart. The log file should show something like the following: Processing CartController#add (for 127.0.0.1 at 2006-10-09 15:07:07) [POST] Session ID: bc2009ee48c083165c6196ac7ff4b44c Parameters: {"action"=>"add", "id"=>"book_22", "controller"=>"cart"} [4;35;1mCart Load (0.000296) [0m [0mSELECT * FROM carts WHERE (carts.id = 1654) LIMIT 1 [0m [4;36;1mBook Load (0.000420) [0m [0;1mSELECT * FROM books WHERE (books.id = 'book_22') LIMIT 1 [0m ActiveRecord::RecordNotFound (Couldn't find Book with ID=book_22): You can see that the id passed to the add action is the DOM id of the dragged element. However, since the add action wants only the actual id of the book (22 in this case), we need to clean up the passed value a bit. Add the highlighted code to app/controllers/ cart_controller.rb: def add params[:id].gsub!(/book_/, "") @book = Book.find(params[:id])

The product set allows you to list, create, update, and delete products: catalog_product.currentStore catalog_product.list catalog_product.info catalog_product.create catalog_product.update catalog_product.setSpecialPrice catalog_product.getSpecialPrice catalog_product.delete

If you have caught an exception but you want to raise it again (pass it on, so to speak), you can call raise without any arguments. (You can also supply the exception explicitly if you catch it, as explained in the section Catching the Object, later in this chapter.) As an example of how this might be useful, consider a calculator class that has the capability to muffle ZeroDivisionErrors. If this behavior is turned on, the calculator prints out an error message instead of letting the exception propagate. This is useful if the calculator is used in an interactive session with a user, but if it is used internally in a program, raising an exception would be better. Therefore the muffling can be turned off. Here is the code for such a class: class MuffledCalculator: muffled = 0 def calc(self, expr): try: return eval(expr) except ZeroDivisionError: if self.muffled: print 'Division by zero is illegal' else: raise