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This commit is contained in:
Christian Georgi
2020-02-11 07:54:27 +00:00
parent ba054305a6
commit d54b16bd94
1 changed files with 3 additions and 3 deletions
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6
packages/bookshop/srv/cat-service.js
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@@ -16,10 +16,10 @@ function _addDiscount2 (each,discount) {
async function _reduceStock (req) {
const { Items: orderItems } = req.data
return cds.transaction(req) .run (()=> orderItems.map (order =>
return cds.transaction(req) .run (()=> orderItems.map (item =>
UPDATE (Books)
.set ('stock -=', order.amount)
.where ('ID =', order.book_ID) .and ('stock >=', order.amount)
.set ('stock -=', item.amount)
.where ('ID =', item.book_ID) .and ('stock >=', item.amount)
)).then (all => all.forEach ((affectedRows,i) => {
if (affectedRows === 0) req.error (409,
`${orderItems[i].amount} exceeds stock for book #${orderItems[i].book_ID}`