.

bookshop/package.json

@@ -21,6 +21,8 @@
   },
   "cds": {
     "requires": {
+      "extensibility": true,
+      "-toggles": true,
       "db": {
         "kind": "sql"
       }

bookshop/srv/cat-service.js

@@ -1,13 +1,20 @@
 const cds = require('@sap/cds')
-
+class CatalogService extends cds.ApplicationService { async init(){
-class CatalogService extends cds.ApplicationService { init(){
 
   const { Books } = cds.entities ('sap.capire.bookshop')
+  const { ListOfBooks } = this.entities
+
+  this.on('READ','ListOfBooks', ()=>{
+    Error.stackTraceLimit = 22
+    cds._debug = true
+    return SELECT.from (ListOfBooks)
+  })
 
   // Reduce stock of ordered books if available stock suffices
   this.on ('submitOrder', async req => {
     const {book,quantity} = req.data
     if (quantity < 1) return req.reject (400,`quantity has to be 1 or more`)
+    cds._debug = true
     let b = await SELECT `stock` .from (Books,book)
     if (!b) return req.error (404,`Book #${book} doesn't exist`)
     let {stock} = b
@@ -22,7 +29,8 @@ class CatalogService extends cds.ApplicationService { init(){
     if (each.stock > 111) each.title += ` -- 11% discount!`
   })
 
-  return super.init()
+  await super.init()
+  return
 }}
 
 module.exports = { CatalogService }