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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)

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Jan 20, 2019 · JavaScript QR code scanner. About a year ago we started development of Web based mobile application development targeting to run in ...

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Lightweight Javascript QR Code Scanner. Contribute to nimiq/qr-scanner development by creating an account on GitHub.

In the PivotTable Field List pane, Excel automatically adds a special field button when multiple value fields are in the layout. You ll use that button to relocate the value fields. 1. Select a cell in the pivot table to activate it. 2. In the PivotTable Field List pane, in the Column Labels area, locate the Values button that represents the value field labels (see Figure 4-11).

Figure 3-50. Creating a new a database diagram A multi-select Add Table dialog box will pop up to allow you to select the database tables you want to appear in the diagram. Use the Ctrl key to multi-select the Breads, Condiments, SandwichOrders, and Stuffs tables, click the Add button, and then the Close button.

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Oct 25, 2018 · A QR Code is a 2-dimensional bar code. They're generally used to encode a URL so someone can just scan the code and visit a site.

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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)

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Figure 4-11. Value field labels in the PivotTable Field List pane 3. Drag the Values button to the Row Labels area, below the Service field. 4. Release the mouse button, and the value field labels will move to the Row Labels area. In the pivot table, the value field labels are listed under each service type. To see the summary differently, you could move the Values field in the PivotTable Field List pane so it s above the Service field in the Row Labels area. With that layout, the services would be listed under each value field heading.

# Billing Information assert order.errors.on(:card_type) assert order.errors.on(:card_number) assert order.errors.on(:card_expiration_month) assert order.errors.on(:card_expiration_year) assert order.errors.on(:card_verification_value) assert order.errors.on(:customer_ip) end Run the unit test one last time: $ ruby test/unit/order_test.rb You should see the tests pass.

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