README

Prerequisites

The setup steps expect following tools installed on the system.

• Github
• Ruby "3.0.0"
• Rails "7.0.8.1"

1. Check out the repository

git clone git@github.com:eprusakov/cash_register.git

2. Install gems

bundle install

3. Start the Rails console

You can start the rails console using the command given below.

bundle exec rails c

And now you can use application inside the rails console

Usage

1. Create rules' set from available rules

pricing_rules = [Rules::GreenTeaDiscount.new, Rules::StrawberryDiscount.new, Rules::CoffeeDiscount.new]

Available rules

1. Rule makes each 2nd green tea free to buy

Rules::GreenTeaDiscount

2. Rule makes each strawberry to cost 4.50 if there are 3 or more strawberiies in a cart

Rules::StrawberryDiscount

3. Rule drops all coffee prices to 2/3 from the initial cost if there 3 or more coffees in a cart

Rules::CoffeeDiscount

2. Create products' preset using any values you want, but keep keys

green_tea = Product.new(code: "GT1", name: "Green Tea", price: 3.11)

Available product's with discount

1. Green tea

Product.new(code: "GT1", name: "Green Tea", price: 3.11)

2. Strawberry

Product.new(code: "SB1", name: "Strawberry", price: 5.00)

3. Coffee

Product.new(code: "CF1", name: "Coffee", price: 11.23)

3. Create cart's instance

checkout = Checkout.new(pricing_rules)

4. Scan any amount of products

checkout.scan(green_tea)
checkout.scan(*smth_other*)

5. Check all cart items with quantity

checkout.cart

6. Check total price of current cart

checkout.total