.

.env

@@ -0,0 +1 @@
+# cdsc

bookshop/db/schema.cds

@@ -1,4 +1,4 @@
-using { Currency, managed, sap } from '@sap/cds/common';
+using { Currency, managed, temporal, sap } from '@sap/cds/common';
 namespace sap.capire.bookshop;
 
 entity Books : managed {

bookshop/srv/admin-service.cds

@@ -1,5 +1,27 @@
 using { sap.capire.bookshop as my } from '../db/schema';
 service AdminService @(requires:'admin') {
-  entity Books as projection on my.Books;
+
+  entity Books as SELECT from my.Books { *,
+    // key ID, key validFrom
+  };
   entity Authors as projection on my.Authors;
+
+  // @cds.redirection.target:false
+  // entity Books.history @(cds.temporal:false) as projection on Books {
+  //   *,
+  //   key ID,
+  //   key validFrom @(cds.valid.from:false),
+  //   validTo @(cds.valid.to:false),
+  // };
+}
+
+// entity NonTemporalBook as projection on my.Books {
+//       *,
+//     key ID,
+//     key validFrom @(cds.valid.from:false),
+//     validTo @(cds.valid.to:false),
+// };
+
+extend my.Books with {
+  history : Composition of many my.Books on history.ID = $self.ID;
 }

bookshop/srv/cat-service.js

@@ -16,7 +16,7 @@ class CatalogService extends cds.ApplicationService { init(){
   })
 
   // Add some discount for overstocked books
-  this.after ('READ','Books', each => {
+  this.after ('READ','ListOfBooks', each => {
     if (each.stock > 111) {
       each.title += ` -- 11% discount!`
     }