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Benefiting from cds.context

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This commit is contained in:
Daniel
2020-12-17 16:39:01 +01:00
parent 86e5c429bd
commit 9e45ac2f0c
6 changed files with 20 additions and 26 deletions
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2
bookshop/srv/admin-service.js
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@@ -7,6 +7,6 @@ module.exports = cds.service.impl (function(){
/** Generate primary keys for target entity in request */
async function genid (req) {
const {ID} = await cds.tx(req).run (SELECT.one.from(req.target).columns('max(ID) as ID'))
const {ID} = await SELECT.one.from(req.target).columns('max(ID) as ID')
req.data.ID = ID - ID % 100 + 100 + 1
}

10
bookshop/srv/cat-service.js
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@@ -1,15 +1,15 @@
const cds = require('@sap/cds')
const { Books } = cds.entities ('sap.capire.bookshop')
class CatalogService extends cds.ApplicationService { async init(){
class CatalogService extends cds.ApplicationService { init(){
// Reduce stock of ordered books if available stock suffices
this.on ('submitOrder', async req => {
const {book,amount} = req.data, tx = cds.tx(req)
let {stock} = await tx.read('stock').from(Books,book)
const {book,amount} = req.data
let {stock} = await SELECT('stock').from(Books,book)
if (stock >= amount) {
await tx.update (Books,book).with ({ stock: stock -= amount })
this.emit ('OrderedBook', { book, amount, buyer:req.user.id })
await UPDATE (Books,book).with ({ stock: stock -= amount })
await this.emit ('OrderedBook', { book, amount, buyer:req.user.id })
return { stock }
}
else return req.error (409,`${amount} exceeds stock for book #${book}`)