class Cart:
def __init__(self):
self.products = []
def add(self, obj):
self.products.append(obj)
def notify(self):
for obj in self.products:
obj.notify(len(self.products))
def price(self):
for obj in self.products:
print(obj.price)
class Checkout():
def __init__(self,cart):
self.cart = cart
self.products = self.cart.products
self.totals = 0
self.accounting()
def total(self):
print(self.totals)
return (self.totals)
def accounting(self):
for obj in self.products:
self.totals = self.totals + obj.price
def bill(self):
pass
class Shipping():
def __init__(self,checkout,ship):
self.ship = ship
checkout.totals = checkout.totals + ship.getCost()
def cost(self):
print(self.ship.getCost())
class UPS():
def __init__(self):
self.cost = 15.2
def getCost(self):
return self.cost
class FedEx(Shipping):
def __init__(self):
self.cost = 10
def getCost(self):
return self.cost
class Payment():
def __init__(self, checkout):
pass
def payable(self):
pass
def tax(self):
pass
+-------------+ +-----------------------+
User -> Goods -> Cart -> | Delivery | -> | Promotions components | -> Checkout
+-------------+ +-----------------------+
| rule A | | Promotion rule 1 |
| rule B | | Promotion rule 2 |
| rule C | | Promotion rule 3 |
| rule D | | Promotion rule 4 |
| rule E | | Promotion rule 5 |
+-------------+ +-----------------------+
数据库设计
+--------------+
| shipping |
+--------------+
| id |o---+
| name | |
| ... | |
+--------------+ | +----------------------+
| | shipping_rule |
+--------------+ | +----------------------+
| zone | | | id |
+--------------+ +--->| shipping_id |
| id |o------->| zone_id |
| name | | plugin |
| | | ... |
+--------------+ +----------------------+
+--------------+
| delivery |
+--------------+
| id |
| user_id |o------>
| address_id |o------>
+--------------+
原文出处：Netkiller 系列 手札
本文作者：陈景峯
转载请与作者联系，同时请务必标明文章原始出处和作者信息及本声明。
