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'Sir Lancelot' This means that you have to worry about the contents of globalName when you use instances (objects) of the class OpenObject. In fact, you have to make sure that nobody changes it: >>> globalName = 'Sir Gumby' >>> o.getName() 'Sir Gumby' Things get even more problematic if you try to create more than one OpenObject because they will all be messing with the same variable: >>> o1 = OpenObject() >>> o2 = OpenObject() >>> o1.setName('Robin Hood') >>> o2.getName() 'Robin Hood' As you can see, setting the name of one automatically sets the name of the other. Not exactly what you want. Basically, you want to treat objects as abstract. When you call a method you don t want to worry about anything else, such as not disturbing global variables. So how can you encapsulate the name within the object No problem. You make it an attribute. Attributes are variables that are a part of the object, just like methods; actually methods are almost like attributes bound to functions. (You ll see an important difference between methods and functions in the section Attributes, Functions, and Methods, later in this chapter.) If you rewrite the class to use an attribute instead of a global variable, and you rename it ClosedObject, it works like this: >>> c = ClosedObject() >>> c.setName('Sir Lancelot') >>> c.getName() 'Sir Lancelot' So far, so good. But for all you know, this could still be stored in a global variable. Let s make another object: >>> r = ClosedObject() >>> r.setName('Sir Robin') r.getName() 'Sir Robin' Here we can see that the new object has its name set properly. Well, we expected that. But what has happened to the first object now >>> c.getName() 'Sir Lancelot'

def enter_site(name) open_session do |session| session.extend(BrowsingTestDSL) session.name = name yield session if block_given end end end Our new test method makes Jill search for Leo Tolstoy with a search form and checks that the resulting result list will have exactly as many books as Leo has provided the shop, namely two. We use the url_encode method to escape white space from the search string. It is provided by the ERB::Util library, so we need to require it at the beginning of our module. Last, we test that the books in the resulting list have the correct names by going through all the books written by Leo and checking that there is a dt element containing the book s title.

Method: directory_country.list ()

Now that we have the integration test made, we can start implementing the thing for real. We first create a simple search form template. Save the following code in app/views/catalog/_ search_box.rhtml: <%= <%= <%= <%= form_tag({:action => "search"}, {:method => "get"}) %> text_field_tag :q %> submit_tag "Search" %> end_form_tag %>

The name is still there! What I have done is give the object its own state. The state of an object is described by its attributes (like its name, for example). The methods of an object may change these attributes. So it s like lumping together a bunch of functions (the methods) and giving them access to some variables (the attributes) where they can keep values stored between function calls.

array ( 0 => array ( 'country_id' => 'AD', 'iso2_code' => 'AD',

Saving it as a partial makes it possible for us to easily embed the search form in other pages. In the code, we create a simple form that points to the search action and uses the get method. Using get instead of post will make the query string be a part of the URL. That way, Jill can circulate a link to her search results to all of her friends. Our form has only two elements: a text field q and the submit button. In the actual search template, we display the partial using the render method. Save the following line to app/views/catalog/search.rhtml: <%= render :partial => "search_box" %>

'iso3_code' => 'AND', 'name' => 'Andorra', ), 1 => array ( 'country_id' => 'AE', 'iso2_code' => 'AE', 'iso3_code' => 'ARE', 'name' => 'United Arab Emirates', ), 2 => array ( 'country_id' => 'AF', 'iso2_code' => 'AF', 'iso3_code' => 'AFG', 'name' => 'Afghanistan', ),