# Zniżki na RC+y

## Wymagania

## Diagramig

class DiscountApplicabilityChecker
  def call
    check_user_constraint
    check_user_constraint
    check_user_constraint
  end
  
  def check_user_constraint
    disocunt_constraints.where()
  end
end

@startuml

class Discount {
    + type
    + value
    + prefix
    + enabled
    + discountable_type
    + discountable_id / future
}


class DiscountableConstraint {
    + discount_id
    + constrainable_type
    + constrainable_id
}

class OrderItem {
    + orderable_id
    + orderable_type
    + value : decimal
    
}

Reservation --{ OrderItem



Discount -- DiscountableConstraint

#### DiscountableConstraints

discount_id, constrainable_type, constrainable_id
1,User,5
1, Restaurant, 1
1,FestivalEditon,1
1,Degustation, null
2,DeliveryFee, null

#### OrderItems

id, orderable_type, orderable_id, qty, unit_price, value, related_id, reserv_id
1, Menu, 5, 2, 200.0, 400.0, NULL, 567
2, CrossSell, 21, 1, 50.0, 50.0, NULL, 567
3, ReservationExtra, 31, 1, 30.0, 30.0, NULL, 567 
4, Discount, 55, 1, -40.0, -40.0, 5, 567
5,