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These should be reflected in the four LunchCounter database tables. Note that there are three many-to-one relationships in these orders: two condiments in Orders 1 and 2, and two stuffs in Order 4. The tables should reflect these. Figure 3-45 shows the four instances of SandwichOrder in the SandwichOrders table. This table contains the order keys only, since all the remaining data of an order (the Bread, Stuffs, and Condiments values) are reflected in the three other tables. If Lola and Norm get into further design iterations and refinements, the SandwichOrders table might contain other data, such as an Order timestamp. But for now, each instance in the table has only a key, reflected as a foreign key in each of the Breads, Condiments, and Stuffs tables.

8. In the Value Field Settings dialog box, select the Average function on the Summarize By tab. 9. Enter Avg WO for Custom Name. 10. Click the Number Format button, and change the number format to Currency.

customer. If we receive an error message from the payment gateway, or something else fails in the order processing, we store it in the error_message field and set the status to failed.

Note The currency symbol in your pivot table will depend on the regional settings in your computer.

Tip If you want to keep an audit trail of all the changes that have been done to an order, you can use the

Figure 3-45. The SandwichOrders table, which contains only the order key Figure 3-46 shows the Breads table. Note that there is only one Bread value for each order, which is what you would expect, since this is how the orders were set up in the sample DSL file. Besides, one Bread per SandwichOrder is a business rule that was reflected in the LunchCounter.Schema.m file.

acts_as_versioned plugin, which can be found at http://ar-versioned.rubyforge.org/.

11. Click the OK button to close the Format Cells dialog box, and then click OK to close the Value Field Settings dialog box. 12. To make the pivot table easier to read, change the number format for the TotalFee field to the Currency format. The pivot table now shows the total charged for each service type and the average amount charged for each service type (see Figure 4-8). Replacements have the highest total fees collected, and installations have the highest average fee.

Figure 3-46. The Breads table Figure 3-47 shows the Condiments table, and you can see there are two one-to-many relationships: Order1 has two condiments (Lettuce and Tomato) and Order 2 also has two condiments (Mayo and Mustard). This is as you would expect, given the sample orders in the DSL file.

The books that have been ordered also must be stored somewhere, which will be in the order_items table. Create the model and the migration with the following command: $ script/generate model Order_Item exists exists exists create identical identical exists create app/models/ test/unit/ test/fixtures/ app/models/order_item.rb test/unit/order_item_test.rb test/fixtures/order_items.yml db/migrate db/migrate/012_create_order_items.rb

Once you have multiple value fields in the pivot table, you may want to rearrange them. You ll move the Avg WO field so it is to the left of the Total WO field in the pivot table layout: 1. Select a cell in the pivot table to activate it. 2. In the PivotTable Field List pane, in the Values area, drag the Avg WO field so it is above the Total WO field.

Open db/migrate/012_create_order_items.rb and replace the contents with the following code: class CreateOrderItems < ActiveRecord::Migration def self.up create_table :order_items do |t| t.column :book_id, :integer t.column :order_id, :integer t.column :price, :float t.column :amount, :integer t.column :created_at, :timestamp t.column :updated_at, :timestamp end end def self.down drop_table :order_items end end

Don t drag the field too high, or it will be removed from the pivot table layout. If the pointer has a cirTip

Figure 3-47. The Condiments table Finally, Figure 3-48 shows the values in the Stuffs table, which includes a single many-to-one relationship: Order 4 has two Stuff values (Grilled Tofu and Portabella). Again, this is confirmed by the expression of the fourth order in the list: Grilled Tofu & Portabella in Pita with Lettuce. So the database instances appear to be entirely consistent with the model.

We store the price of the ordered book and the amount of books ordered. We link each order item to a book and an order. You can now run the migrations by executing the following: $ rake db:migrate

3. As you drag the field, a light gray bar will appear above the Total WO field, indicating where the field will be dropped (see Figure 4-9).