cleaned up

orders/db/data/sap.capire.bookshop-OrderItems.csv

@@ -0,0 +1,4 @@
+ID;amount;parent_ID;book_ID;netAmount
+58040e66-1dcd-4ffb-ab10-fdce32028b79;1;7e2f2640-6866-4dcf-8f4d-3027aa831cad;201;11.11
+64e718c9-ff99-47f1-8ca3-950c850777d4;1;7e2f2640-6866-4dcf-8f4d-3027aa831cad;271;15
+e9641166-e050-4261-bfee-d1e797e6cb7f;2;64e718c9-ff99-47f1-8ca3-950c850777d4;252;28

orders/db/data/sap.capire.bookshop-Orders.csv

@@ -0,0 +1,3 @@
+ID;modifiedAt;createdAt;createdBy;modifiedBy;OrderNo;currency_code
+7e2f2640-6866-4dcf-8f4d-3027aa831cad;;2019-01-31;john.doe@test.com;;1;EUR
+64e718c9-ff99-47f1-8ca3-950c850777d4;;2019-01-30;jane.doe@test.com;;2;EUR

orders/db/schema.cds

@@ -0,0 +1,17 @@
+using { sap.capire.bookshop.Books } from '@capire/bookshop/db/schema';
+using { Currency, managed, cuid } from '@sap/cds/common';
+namespace sap.capire.bookshop;
+
+entity Orders : cuid, managed {
+  OrderNo  : String @title:'Order Number'; //> readable key
+  Items    : Composition of many OrderItems on Items.parent = $self;
+  total    : Decimal(9,2) @readonly;
+  currency : Currency;
+}
+
+entity OrderItems : cuid {
+  parent    : Association to Orders;
+  book      : Association to Books;
+  amount    : Integer;
+  netAmount : Decimal(9,2);
+}

orders/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "@capire/orders",
+  "version": "1.0.0",
+  "license": "SAP SAMPLE CODE LICENSE"
+}

orders/srv/orders-service.cds

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+using { sap.capire.bookshop as my } from '../db/schema';
+
+service OrdersService {
+  entity Orders as projection on my.Orders;
+}

orders/srv/orders-service.js

@@ -0,0 +1,21 @@
+const cds = require('@sap/cds')
+
+module.exports = cds.service.impl(function() {
+
+  const { Books } = cds.entities
+
+  // Reduce stock of ordered books if available stock suffices
+  this.before ('CREATE', 'Orders', (req) => {
+    const { Items: OrderItems } = req.data
+    return cds.transaction(req) .run (()=> OrderItems.map (order =>
+      UPDATE (Books) .where ('ID =', order.book_ID)
+      .and ('stock >=', order.amount)
+      .set ('stock -=', order.amount)
+    )) .then (all => all.forEach ((affectedRows,i) => {
+      if (affectedRows === 0)  req.error (409,
+        `${OrderItems[i].amount} exceeds stock for book #${OrderItems[i].book_ID}`
+      )
+    }))
+  })
+
+})