Ruby Task

The fictional website www.great-fashion.com is an online store with the following products available for purchase:

Product Code	Name	Price
001	Red Scarf	£9.25
002	Silver cufflinks	£45.00
003	Silk Dress	£19.95

The marketing team want to offer promotions as an incentive for customers to purchase these items.

When spending over £60, the customer gets 10% off their purchase When purchasing 2 or more of the Red Scarf, its price is reduced to £8.50.

The check-out system can scan items in any order, and because promotions will change, it needs to be flexible regarding promotional rules.

The interface to the checkout looks like this (shown in Ruby):

co = Checkout.new(promotional_rules)
co.scan(order)
co.scan(order)
price = co.total

Implement a simple checkout system that fulfills these requirements and the interface shown above.

Example Test Data

Basket: 001, 002, 003
Total price expected: £66.78

Basket: 001, 003, 001
Total price expected: £36.95

Basket: 001, 002, 001, 003
Total price expected: £73.76

Models

Product

• contains the details about the product with the following attributes: code, name, price
• see example product table above

Order

• same as the basket with the following attributes: product, quantity
• see example test data above

PromotionalRule

• contains the details about the promotional rules with the following attributes:
  • type can have a value: "quantity_equal_or_over" or "total_over" (or you can add your own like "free_shipping")
  • for_all_orders expects a boolean value
  • rule_details should contain the details you will be using for a specific promotional rule
• for rule type "quantity_equal_or_over" - the details are quantity_product_code, quantity_max, quantity_fixed_price
• for rule type "total_over" - the details are total_max_price, total_percent_discount