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We start by extending our integration test to span searching, too. We do this by adding a new method, searches_for_tolstoy, to the BrowsingTestDSL module in test/integration/ browsing_and_searching_test.rb, as shown in Listing 4-2. Listing 4-2. Test Method for Book Searches require "#{File.dirname(__FILE__)}/../test_helper" class BrowsingAndSearchingTest < ActionController::IntegrationTest fixtures :publishers, :authors, :books, :authors_books def test_browsing_the_site jill = enter_site(:jill) jill.browse_index jill.go_to_second_page jill.searches_for_tolstoy end def test_getting_details jill = enter_site(:jill) jill.get_book_details_for "Pride and Prejudice" end private module BrowsingTestDSL include ERB::Util attr_writer :name def browse_index get "/catalog" assert_response :success assert_template "catalog/index" assert_tag :tag => "dl", :attributes => { :id => "books" }, :children => { :count => 10, :only => {:tag => "dt"}} assert_tag :tag => "dt", :content => "The Idiot" check_book_links end

Note The form of polymorphism discussed here, which is so central to the Python way of programming,

// Prepare information to remove $address_id = '465'; // using Zend XML-RPC method $result = $client->call('call', array($session_id, 'customer_address.delete', array($address_id))); // display true if successful var_dump($result);

def go_to_second_page get "/catalog page=2" assert_response :success assert_template "catalog/index" assert_equal Book.find_by_title("Pro Rails E-Commerce"), assigns(:books).last check_book_links end def get_book_details_for(title) @book = Book.find_by_title(title) get "/catalog/show/#{@book.id}" assert_response :success assert_template "catalog/show" assert_tag assert_tag end def searches_for_tolstoy leo = Author.find_by_first_name_and_last_name("Leo", "Tolstoy") get "/catalog/search q=#{url_encode("Leo Tolstoy")}" assert_response :success assert_template "catalog/search" assert_tag :tag => "dl", :attributes => { :id => "books" }, :children => { :count => leo.books.size, :only => {:tag => "dt"}} :tag => "h1", :content => @book.title :tag => "h2", :content => "by #{@book.authors.map{|a| a.name}}"

The directory API is used only to list information on country and region codes. These values cannot be changed; they are required when inputting customer address information.

Encapsulation is the principle of hiding unnecessary details from the rest of the world. This may sound like polymorphism there, too, you use an object without knowing its inner details. The two concepts are similar because they are both principles of abstraction they both help you deal with the components of your program without caring about unnecessary detail, just like functions do. But encapsulation isn t the same as polymorphism. Polymorphism enables you to call the methods of an object without knowing its class (type of object). Encapsulation enables you to use the object without worrying about how it s constructed. Does it still sound similar Let s construct an example with polymorphism, but without encapsulation. Assume that you have a class called OpenObject (you learn how to create classes later in this chapter): >>> o = OpenObject() # This is how we create objects... >>> o.setName('Sir Lancelot') >>> o.getName() 'Sir Lancelot' You create an object (by calling the class as if it were a function) and bind the variable o to it. You can then use the methods setName and getName (assuming that they are methods that are supported by the class OpenObject). Everything seems to be working perfectly. However, let s assume that o stores its name in the global variable globalName: >>> globalName

leo.books.each do |book| assert_tag :tag => "dt", :content => book.title end end def check_book_links for book in assigns(:books) assert_tag :tag => "a", :attributes => { :href => "/catalog/show/#{book.id}"} end end end

The only methods available are basic listings: directory_country.list() directory_region.list()