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We need to validate the billing information, but there s one problem. We don t want to store that information in the database, so there are no fields in our model that we can validate. We can fix this by adding the code we have highlighted here to app/models/order.rb: class Order < ActiveRecord::Base attr_protected :id, :customer_ip, :status, :error_message, :updated_at, :created_at attr_accessor :card_type, :card_number, :card_expiration_month, :card_expiration_year, :card_verification_value has_many :order_items has_many :books, :through => :order_items Using attr_accessor has the same result as adding a getter and a setter for each of the attributes. However, it can all be done with one line, instead of something like this: def card_type=(type) @card_type = type end def card_type @card_type end Collecting correct information on the checkout page is important. If the customer misspells her e-mail address or forgets to enter information in one of the required fields, George might not be able to complete the order. To help prevent this, add the following validations to the Order model (app/models/order.rb): validates_size_of :order_items, :minimum => 1 validates_length_of :ship_to_first_name, :in => 2..255 validates_length_of :ship_to_last_name, :in => 2..255 validates_length_of :ship_to_address, :in => 2..255 validates_length_of :ship_to_city, :in => 2..255 validates_length_of :ship_to_postal_code, :in => 2..255 validates_length_of :ship_to_country, :in => 2..255 validates_length_of :phone_number, :in => 7..20 validates_length_of :customer_ip, :in => 7..15 validates_format_of :email, :with => /^([^@\s]+)@(( :[-a-z0-9]+\.)+[a-z]{2,})$/i validates_inclusion_of :status, :in => %w(open processed closed failed)

Figure 6 45. Not-quite-duplicate names and you launch a Remove Duplicates search of the Last Name field, the row containing Grace Jones record will be deleted and that not may be what you had in mind, because Grace Jones is obviously not a mere duplicate of Ed Jones. She s a different person. What you d presumably want to do then, is eliminate all duplicates of Ed Jones and if that s your objective, you d need to search for duplicates in both the Last and First Name fields at the same time. So let s go with this example, and this simple collection of names, which contains an obvious duplicate record. In cells L14:N20, type these data, and execute the Insert Table command (Figure 6 45). The format you choose doesn t matter:

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namespace Ch4_TextBox { public partial class Page : UserControl { public Page() { InitializeComponent(); this.btnTry.Click += new RoutedEventHandler(btnTry_Click); } void btnTry_Click(object sender, RoutedEventArgs e) { } } } 5. When the button is clicked, the application will change the Fill property of the Ellipse control, which expects a SolidColorBrush. You can create the SolidColorBrush using the Colors.FromArgb() method, which accepts four arguments: one for opacity,

validates_inclusion_of :card_type, :in => ['Visa', 'MasterCard', 'Discover'], :on => :create validates_length_of :card_number, :in => 13..19, :on => :create validates_inclusion_of :card_expiration_month, :in => %w(1 2 3 4 5 6 7 8 9 10 11 12), :on => :create validates_inclusion_of :card_expiration_year, :in => %w(2006 2007 2008 2009 2010), :on => :create validates_length_of :card_verification_value, :in => 3..4, :on => :create We validate all fields, including credit card information. The credit card fields are validated only on create, as they don t exist in the database. We should also take care that the amount and price are correct, so add the validate callback method shown here to order_items.rb: class OrderItem < ActiveRecord::Base belongs_to :order belongs_to :book def validate errors.add(:amount, "should be one or more") unless amount.nil || amount > 0 errors.add(:price, "should be a positive number") unless price.nil || price > 0.0 end This method validates that the customer is ordering at least one book and that the price is a positive number. Let s add the following test to test/unit/order_test.rb, which verifies that all fields are validated: def test_that_validation_works order = Order.new assert_equal false, order.save # An order should have at least one order item assert order.errors.on(:order_items) assert_equal 15, order.errors.size # Contact Information assert order.errors.on(:email) assert order.errors.on(:phone_number) # Shipping Address assert order.errors.on(:ship_to_first_name) assert order.errors.on(:ship_to_last_name) assert order.errors.on(:ship_to_address) assert order.errors.on(:ship_to_city) assert order.errors.on(:ship_to_postal_code) assert order.errors.on(:ship_to_country)

Figure 6 46. Broken record: Two Ed Joneses You added the Age field, because there could well be two persons in the database named Ed Jones with different ages. Then click anywhere in the table and click Remove Duplicates on the Tools Button group. You ll see (Figure 6 46):

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