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But that s not all. In fact, you can access the attributes of an object from the outside, too: >>> c.name 'Sir Lancelot' >>> c.name = 'Sir Gumby' >>> c.getName() 'Sir Gumby' Some programmers are okay with this, but some (like the creators of SmallTalk, a language where attributes of an object are only accessible to the methods of the same object) feel that it breaks with the principle of encapsulation. They believe that the state of the object should be completely hidden (inaccessible) to the outside world. You might wonder why they take such an extreme stand. Isn t it enough that each object manages its own attributes Why should you hide them from the world After all, if you just used the name attribute directly in ClosedObject, you wouldn t have to make the setName and getName methods. The point is that other programmers may not know (and perhaps shouldn t know) what s going on inside your object. For example, ClosedObject may send an email to some administrator every time an object changes its name. This could be part of the setName method. But what happens when you set c.name directly Nothing. No email is sent. To avoid this sort of thing, you have private attributes, attributes that are not accessible outside the object but only through accessor methods such as getName and setName.

Next, open app/controllers/catalog_controller.rb and implement the search action. def search @page_title = "Search" if params[:commit] == "Search" || params[:q] @books = Book.find_by_contents(params[:q].to_s.upcase) unless @books.size > 0 flash.now[:notice] = "No books found matching your criteria" end end end In the search action, we first specify the title for the page. Then we continue in two different directions, depending on whether the search form was already submitted or the search page was just requested normally. We do the separation by checking if either the value of a query parameter commit is "Search" or the query variable q is specified. From the _search.rhtml partial view, q contains the search text that was submitted by the search form. If our code determines that the form has been submitted, it executes the search using the find_by_contents class method and the query parameter q. Furthermore, if there are no books found with the terms, it sets the flash notice to show a message to the user.

// using SOAP method $results = $client->call($session_id, 'directory_country.list'); // output results var_dump($results);

Python doesn t support privacy directly, but relies on the programmer to know when it is safe to modify an attribute from the outside. After all, you ought to know how to use an object before using it. It is, however, possible to achieve something like private attributes with a little trickery. To make a method or attribute private (inaccessible from the outside), simply start its name with two underscores: class Secretive: def __inaccessible(self): print "Bet you can't see me..." def accessible(self): print "The secret message is:" self.__inaccessible()

Now we need to extend our search view so that it shows either the books found or the Not found notice. Add the following to app/views/catalog/search.rhtml: <%= render :partial => "search_box" %> <% if @books %> <p>Your search "<%= params[:q] %>" produced <%= pluralize @books.size, "result" %>:</p> <%= render(:partial => "books") %> <% end %> If the search was successful, we also tell how many hits there were. We use the pluralize helper to show the number of books, and the word result in singular or plural depending on the count. Last, we render a partial to show a list of matching books.

Method: directory_region.list ($country)

We don t have a partial view called books yet, so we need to create it. In the index action, we also showed a list of books, so it is a good place to extract the list. Move the following code from app/views/catalog/index.rhtml to app/views/catalog/_books.rhtml. <dl id="books"> <% for book in @books %> <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: <%= book.publisher.name %></small></dd> <% end %> </dl> Now we can just replace the moved code in index.rhtml with a similar render call that we have in the end of the search.rhtml template, and that s it! We have a functioning search form in the bookstore. If you have already added some books to your development system, you can point your browser to /catalog/search on your development site and see the result for yourself, as shown in Figure 4-3. (First, you will need to restart your web server, so it will pick up the introduced Ferret code.)