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Figure 3-52. LunchCounter database diagram displayed in SSMS You could also use a JOIN select statement to create a consolidated view of the sandwich orders. To do this, close the Object Explorer pane by clicking the X in the upper-right corner of the Object Explorer pane. Click New Query on the tool ribbon (Figure 3-53). Click the Query menu item, then choose the Design Query in Editor option (see Figure 3-53).

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Let s start with the first scenario. When the cart is empty, the user shouldn t be able to perform a checkout. This can be verified by replacing the test_truth method in test/integration/ checkout_test.rb with the code shown here: def test_that_empty_cart_shows_error_message get '/checkout' assert_response :redirect assert_redirected_to :controller => "catalog" assert_equal "Your shopping cart is empty! Please add something to it before proceeding to checkout.", flash[:notice] end This test verifies that when the cart is empty, we are redirected to the catalog page and an error message is displayed. If you run the test now, it fails, because we haven t implemented the controller yet. Open app/controllers/checkout_controller.rb in your editor and change the index method as follows: def index @order = Order.new @page_title = "Checkout" if @cart.books.empty flash[:notice] = "Your shopping cart is empty! Please add something to it before proceeding to checkout." redirect_to :controller => 'catalog' end end Also add the initialize_cart filter to the controller: class CheckoutController < ApplicationController before_filter :initialize_cart def index Recall that this filter was implemented in 5. It initializes the cart, so that we can access it from the Checkout controller and views. It also enables us to show the shopping cart to the right on the page (also implemented in 5). Execute the test with the following command: $ ruby test/integration/checkout_test.rb

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Figure 4-13. Grand totals for rows and grand totals for columns When you add fields to the Row Labels or Column Labels area, Excel automatically adds the grand totals to the pivot table layout. In some cases, you may not want either of the grand totals displayed. You ll hide the row grand total at the right of the pivot table. This will reduce the number of columns in the pivot table and will help focus the reader s attention on the comparison between one-technician and two-technician calls. 1. Select a cell in the pivot table to activate it. 2. On the Ribbon, under the PivotTable Tools tab, click the Options tab.

You should see no errors. Perform a manual test by opening http://localhost:3000/ checkout. Because the shopping cart is empty, you should be redirected to the catalog page, where the error message in Figure 9-1 is displayed.

3. At the far left, in the PivotTable group, click the Options command (see Figure 4-14) to open the PivotTable Options dialog box.

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Figure 3-54. Selecting the LunchCounter tables for the JOIN query This will bring up an empty Query Designer window, with an Add Table dialog box (Figure 3-54). Select the four LunchCounter tables in the following order, clicking the Add button after each selection: SandwichOrders (LunchCounter) Stuffs (LunchCounter) Breads (LunchCounter) Condiments (LunchCounter)

Figure 9-1. The catalog page displaying an empty cart error message Next, we ll add a test for the second scenario. When the shopping cart contains one or more items (books), we want to display a form with three sections: contact information, shipping address, and billing information. First, add the following fixtures and test to test/integration/checkout_test.rb: fixtures :authors, :publishers, :books def test_that_placing_an_order_works post '/cart/add', :id => 1 get '/checkout' assert_response :success assert_tag :tag => 'legend', :content => 'Contact Information' assert_tag :tag => 'legend', :content => 'Shipping Address' assert_tag :tag => 'legend', :content => 'Billing Information' end The test begins by adding a book (defined in the books fixture file) to the cart by calling the /cart/add action. Then it accesses the checkout page and verifies that the request is successful. It proceeds by checking that the page contains the three required sections. This is done by looking for three legend tags having the following content: Contact Information, Shipping Address, and Billing Information. Now that we have the new test in place, we could try to run it, but it would fail miserably when it tries to find the three sections.

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