CashRegister

Simple implementation for Cash Register with Node.js, Express and MongoDB

Print Receipt

Input

/services/receipt?items=ITEM000001-3,ITEM000002,ITEM000003,ITEM000004

Output in log file:

[2016-03-06 19:28:24.319] [INFO] receipt - ***没钱赚商店购物清单***
[2016-03-06 19:28:24.319] [INFO] receipt - 名称: 可口可乐, 数量: 3瓶, 单价: 3.00(元), 小计: 6.00(元)
[2016-03-06 19:28:24.320] [INFO] receipt - 名称: 羽毛球, 数量: 1个, 单价: 1.00(元), 小计: 0.95(元), 节省： 0.05(元)
[2016-03-06 19:28:24.320] [INFO] receipt - 名称: 苹果, 数量: 1斤, 单价: 5.50(元), 小计: 5.50(元)
[2016-03-06 19:28:24.321] [INFO] receipt - 名称: 草莓, 数量: 1斤, 单价: 15.00(元), 小计: 15.00(元)
[2016-03-06 19:28:24.323] [INFO] receipt - -----------------------
[2016-03-06 19:28:24.323] [INFO] receipt - 买二赠一商品:
[2016-03-06 19:28:24.324] [INFO] receipt - 名称: 可口可乐, 数量: 1瓶
[2016-03-06 19:28:24.324] [INFO] receipt - -----------------------
[2016-03-06 19:28:24.324] [INFO] receipt - 总计: 27.45(元)
[2016-03-06 19:28:24.325] [INFO] receipt - 节省: 3.05(元)
[2016-03-06 19:28:24.326] [INFO] receipt - ***********************

Data Storage

The storage layer is built upon MongoDB, and there're two collections.

Inventory:

[
	{
		"_id": "ITEM000001",
		"name": "可口可乐",
		"unit": "瓶",
		"price": 3
	},
	{
		"_id": "ITEM000002",
		"name": "羽毛球",
		"unit": "个",
		"price": 1
	},
	{
		"_id": "ITEM000003",
		"name": "苹果",
		"unit": "斤",
		"price": 5.5
	},
	{
		"_id": "ITEM000004",
		"name": "草莓",
		"unit": "斤",
		"price": 15
	}
]

DiscountEvent:

[
	{
		"_id": ObjectID("56d8201f271225b433008349"),
		"name": "买二赠一",
		"priority": 3,
		"type": "amount-discount",
		"basecount": 3,
		"freecount": 1,
		"items": [
			"ITEM000001",
			"ITEM000002",
			"ITEM000003"
		]
	},
	{
		"_id": ObjectID("56d82056271225b43300834a"),
		"name": "95折",
		"priority": 1,
		"type": "price-discount",
		"rate": 0.95,
		"items": [
			"ITEM000001",
			"ITEM000002"
		]
	}
]

Quick Start

To install dependency packages

cd YOUR_PATH/CashRegister && npm install

To configure mongodb server

cd YOUR_PATH/CashRegister/config/settings then update the connection string.

To run

cd YOUR_PATH/CashRegister && node bin/www