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Another well-known data structure is the heap, a kind of priority queue. A priority queue lets you add objects in an arbitrary order and at any time (possibly in-between the adding) find (and possibly remove) the smallest element. It does so much more efficiently than, say, using min on a list. In fact, there is no separate heap type in Python only a module with some heapmanipulating functions. The module is called heapq (with the q standing for queue), and it contains six functions, the first four of which are directly related to heap manipulation. You must use a list as the heap object itself. The heappush function is used to add an item to a heap. Note that you shouldn t use it on any old list only one that has been built through the use of the various heap functions. The reason for this is that the order of the elements is important (even though it may look a bit haphazard; the elements aren t exactly sorted).

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)

The CMS section of the administration interface controls any editable content that your site might require. Static content pages, static content blocks, and polls.

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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)

The Manage Pages area gives you the ability to create and modify non-product content pages. These pages allow you to provide customers with additional information about your store, your policies, or any other information that you feel is relevant to share. Example CMS pages are: About Us, Customer Service, and a 404 error page. By default, there are five different layouts that static pages can use: Empty, 1 column, 2 columns with left bar, 2 columns with right bar, and 3 columns. Empty pages will be displayed with a blank white background while each of the four other layouts will display the content between the normal page header and footer. Empty pages are ideal to provide quick information that can be displayed in a small external window (see Figure 4-36).