audit log

bookshop/srv/admin-service.cds

@@ -1,5 +1,5 @@
 using { sap.capire.bookshop as my } from '../db/schema';
-service AdminService @(requires_:'admin') {
+service AdminService @(requires:'admin') {
   entity Books as projection on my.Books;
   entity Authors as projection on my.Authors;
 }

bookshop/srv/admin-service.js

@@ -0,0 +1,13 @@
+const cds = require('@sap/cds/lib')
+
+module.exports = class AdminService extends cds.ApplicationService { init(){
+  this.before ('NEW','Authors', genid)
+  this.before ('NEW','Books', genid)
+  return super.init()
+}}
+
+/** 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'))
+  req.data.ID = ID - ID % 100 + 100 + 1
+}

bookshop/srv/cat-service.cds

@@ -1,10 +1,21 @@
 using { sap.capire.bookshop as my } from '../db/schema';
 service CatalogService @(path:'/browse') {
 
-  @readonly entity Books as SELECT from my.Books {*,
+  /** For displaying lists of Books */
+  @readonly entity ListOfBooks as projection on Books
+  excluding { descr };
+
+  /** For display in details pages */
+  @readonly entity Books as projection on my.Books { *,
     author.name as author
   } excluding { createdBy, modifiedBy };
 
+<<<<<<< HEAD
   @requires_: 'authenticated-user'
   action submitOrder (book : Integer, amount: Integer);
+=======
+  @requires: 'authenticated-user'
+  action submitOrder ( book: Books:ID, quantity: Integer ) returns { stock: Integer };
+  event OrderedBook : { book: Books:ID; quantity: Integer; buyer: String };
+>>>>>>> 534af7ffee60e086c563dbaa450e86e5fca5cf2b
 }

bookshop/srv/cat-service.js

@@ -1,22 +1,29 @@
 const cds = require('@sap/cds')
-module.exports = async function (){
 
-  const db = await cds.connect.to('db') // connect to database service
-  const { Books } = db.entities         // get reflected definitions
+class CatalogService extends cds.ApplicationService { init(){
+
+  const { Books } = cds.entities ('sap.capire.bookshop')
+  const { ListOfBooks } = this.entities
 
   // Reduce stock of ordered books if available stock suffices
   this.on ('submitOrder', async req => {
-    const {book,amount} = req.data
-    const n = await UPDATE (Books, book)
-      .with ({ stock: {'-=': amount }})
-      .where ({ stock: {'>=': amount }})
-    n > 0 || req.error (409,`${amount} exceeds stock for book #${book}`)
+    const {book,quantity} = req.data
+    if (quantity < 1) return req.reject (400,`quantity has to be 1 or more`)
+    let b = await SELECT `stock` .from (Books,book)
+    if (!b) return req.error (404,`Book #${book} doesn't exist`)
+    let {stock} = b
+    if (quantity > stock) return req.reject (409,`${quantity} exceeds stock for book #${book}`)
+    await UPDATE (Books,book) .with ({ stock: stock -= quantity })
+    await this.emit ('OrderedBook', { book, quantity, buyer:req.user.id })
+    return { stock }
   })
 
   // Add some discount for overstocked books
-  this.after ('READ','Books', each => {
-    if (each.stock > 111) {
-      each.title += ` -- 11% discount!`
-    }
+  this.after ('READ', ListOfBooks, each => {
+    if (each.stock > 111) each.title += ` -- 11% discount!`
   })
-}
+
+  return super.init()
+}}
+
+module.exports = { CatalogService }

bookshop/srv/user-service.cds

@@ -0,0 +1,15 @@
+/**
+ * Exposes user information
+ */
+service UserService {
+  /**
+   * The current user
+   */
+  @odata.singleton entity me @cds.persistence.skip {
+    id     : String; // user id
+    locale : String;
+    tenant : String;
+  }
+
+  action login() returns me;
+}

bookshop/srv/user-service.js

@@ -0,0 +1,9 @@
+const cds = require('@sap/cds')
+module.exports = class UserService extends cds.Service { init(){
+  this.on('READ', 'me', ({ tenant, user, locale }) => ({ id: user.id, locale, tenant }))
+  this.on('login', (req) => {
+    if (req.user._is_anonymous)
+      req._.res.set('WWW-Authenticate','Basic realm="Users"').sendStatus(401)
+    else return this.read('me')
+  })
+}}