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Getting back to the exercise, before you go any further, you should save your code. Save the DSL Grammar code by clicking in the center pane so that it has focus, then click the File Save As menu option. Click the Create New Folder icon in the Save As dialog box and rename New Folder to LunchCounter, as shown in Figure 3-30. Save the code in the untitled1* DSL Grammar Mode pane as LunchCounter.mg in the new LunchCounter folder. (The mg file extension is short for Mgrammar, another term for DSL Grammar.) Click in the left pane, then follow a similar procedure (except for creating the new folder), and save the DSL sandwich code as SandwichLanguage.dsl in the LunchCounter folder.

While working in the header, a Design tab is activated on the Ribbon. You can use the commands Tip

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Listing 8-2. First Version of the Authentication Integration Test require "#{File.dirname(__FILE__)}/../test_helper" class AuthenticationTest < ActionController::IntegrationTest def test_successful_login george = enter_site(:george) george.tries_to_go_to_admin end private module BrowsingTestDSL include ERB::Util attr_writer :name def tries_to_go_to_admin get "/admin/book/new" assert_response :redirect assert_redirected_to "/account/login" end end def enter_site(name) open_session do |session| session.extend(BrowsingTestDSL) session.name = name yield session if block_given end end end Here, the most interesting part is in the tries_to_go_to_admin method. This is where we test that the first part of the story goes as planned: George is redirected to the login page when trying to access admin pages. If you run the test, you get the following failure: $ ruby test/integration/authentication_test.rb

5. Before you print the reports, you ll use the Print Preview feature to see how the sheets will look when printed. Click the worksheet to exit the header, click the Microsoft Office Button, point to Print, and click Print Preview. 6. In the Print Preview window, click the worksheet to zoom in or out. At the bottom left of the window you can see the page count is Page 1 of 9, and at the top left of the window you can click Next Page or Previous Page to view the plant reports.

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Loaded suite test/integration/authentication_test Started F Finished in 1.44942 seconds. 1) Failure: test_successful_login(AuthenticationTest) [test/integration/authentication_test.rb:17:in 'tries_to_go_to_admin' test/integration/authentication_test.rb:6:in 'test_successful_login' /usr/local/lib/ruby/gems/1.8/gems/actionpack1.12.1/lib/action_controller/integration.rb:427:in 'run']: Expected response to be a <:redirect>, but was <200> 1 tests, 1 assertions, 1 failures, 0 errors It seems the redirection is not working, which should come as no surprise. Now it s time to put the authentication plugin to work.

Figure 3-30. Creating the C:\LunchCounter folder and saving the DSL Grammar code as LunchCounter.mg

Use the Page Up and Page Dn keys on the keyboard to navigate through the pages in Print Preview. If Tip you have clicked the Zoom command on the Ribbon or clicked the page to zoom in, the Page Up and Page Dn keys will move you up and down on the current page.

In 5, we hinted that filters would be a good fit for implementing authentication functionality in Rails, and that is exactly what acts_as_authenticated does (or, to be precise, makes us do). The AuthenticatedSystem module (which is now included in all our controllers, remember ) implements a function called login_required, which is the workhorse of the whole plugin. If it s called as a before_filter inside a controller, a login check is done before any action in that controller is let loose: class SomeController < ApplicationController before_filter :login_required def first_action # this action is now only available for logged in users end end As you might remember from 5, you can restrict the filter to certain actions by using the :only and :except parameters in the before_filter call: before_filter :login_required, :only => :secret_action before_filter :login_required, :except => [:index, :rss]

7. In the Print Preview window, click Print to open the Print dialog box where you can select a printer and set any other print options, such as the number of copies or the range of pages to print. Then, click OK to print the reports, or click Cancel to close the dialog box without printing.

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