Fixed and adjusted to cds5

bookshop/srv/cat-service.js

@@ -5,10 +5,10 @@ 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 })
+      await UPDATE (Books,book) .with (`stock -=`, amount)
       await this.emit ('OrderedBook', { book, amount, buyer:req.user.id })
       return { stock }
     }
@@ -16,10 +16,8 @@ class CatalogService extends cds.ApplicationService { init(){
   })
 
   // 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()