SpringBoot中基于ItemCode匹配扣减库存可用数量的实现问询

Postman传入的JSON数据 #

[billamount:1000,
disocunt:500,
billcart[{itemcode:1001, quantity:4 }, {itemcode:1002, quantity:7 }]]

库存扣减实现代码 #

@Autowired
private StockRepository stockRepository;

public Bill createBill(Bill bill) {

 for (Billcart data : bill.getBillcart()) {
  Stock entity = stockRepository.findByItemcode(data.getItemcode());

 if(entity.getItemcode() ==data.getItemcode()){
   entity.setAvailableQuantity(entity.getAvailableQuantity()- data.getQuantity())
stockRepository.save(entity)
  }
}

扣减前库存数据 #

[{itemcode:1001, availableQuantity:20 }, {itemcode:1002, availableQuantity:40 }]]

预期扣减后结果 #

[{itemcode:1001, availableQuantity:16 }, {itemcode:1002, availableQuantity:33 }]]

内容的提问来源于stack exchange，提问作者ASIF KAIF