.

fiori/package.json

@@ -21,18 +21,18 @@
     },
     "requires": {
       "API_BUSINESS_PARTNER": {
-        "kind": "odata",
+        "kind": "odata-v2",
         "model": "@capire/suppliers"
       },
       "auth": {
         "strategy": "dummy"
       },
       "ReviewsService": {
-        "kind": "odata",
+        "kind": "odata-v4",
         "model": "@capire/reviews"
       },
       "OrdersService": {
-        "kind": "odata",
+        "kind": "odata-v4",
         "model": "@capire/orders"
       },
       "db": {

fiori/srv/mashup.cds

@@ -23,3 +23,9 @@ using { sap.capire.orders.Orders_Items } from '@capire/orders';
 extend Orders_Items with {
   book : Association to Books on product.ID = book.ID
 }
+
+
+using { OrdersService.Orders } from '@capire/orders';
+// extend service CatalogService with {
+//   entity OrdereredBooks as projection on Orders;
+// }

orders/api/external.cds

@@ -0,0 +1,9 @@
+context external {
+
+  /** This is a stand-in for arbitrary ordered Products */
+  entity Products @(cds.persistence.skip:'always') {
+    key ID : String;
+    data : String;
+  }
+
+}

orders/api/orders-service-comp.cds

@@ -0,0 +1,21 @@
+using { cuid, managed, User, Currency } from '@sap/cds/common';
+using { sap.capire.orders as my } from '../db/schema';
+using { external.Products } from './external';
+
+
+service OrdersService {
+
+  entity Orders : cuid, managed {
+    OrderNo  : String @title:'Order Number'; //> readable key
+    Items    : Composition of many {
+      key ID    : UUID;
+      product   : Association to Products;
+      amount    : Integer;
+      title     : String; //> intentionally replicated as snapshot from product.title
+      price     : Double;
+    };
+    buyer    : User;
+    currency : Currency;
+  }
+
+}

orders/api/orders-service.cds

@@ -0,0 +1,40 @@
+using { cuid, managed, User, Currency } from '@sap/cds/common';
+using { sap.capire.orders as my } from '../db/schema';
+using { external.Products } from './external';
+
+
+// GET Orders
+// GET Orders()/Items
+// GET Orders?$Items
+
+service OwnService {
+  entity Orders as projection on OrdersService.Orders;
+  entity Products as projection on OrdersService.Products;
+}
+
+service OrdersService {
+
+  entity Orders : cuid, managed {
+    OrderNo  : String @title:'Order Number'; //> readable key
+    Items    : Composition of many Orders_Items; // on Items.up_ = $self;
+    // MoreItems    : Composition of many Orders_Items; // on Items.up_ = $self;
+     // Items_ID
+    buyer    : User;
+    currency : Currency;
+  }
+
+  entity Orders_Items {
+    key ID    : UUID;
+    // up_       : Association to Orders;
+    product   : Association to Products; //> {ID}
+    // product_ID
+    amount    : Integer;
+    title     : String; //> intentionally replicated as snapshot from product.title
+    price     : Double;
+  }
+
+  // entity Products {
+  //   key ID : UUID;
+  // }
+
+}

suppliers/index.cds

@@ -1 +0,0 @@
-using from './srv/mashup';

suppliers/package.json

@@ -25,16 +25,8 @@
           }
         }
       },
-      "[local-hybrid]": {
-        "messaging": {
-          "kind": "file-based-messaging"
-        }
-      },
-      "[hybrid]": {
-        "messaging": {
-          "kind": "enterprise-messaging-shared"
-        }
-      }
+      "[local-hybrid]": { "messaging": { "kind": "file-based-messaging" }},
+      "[hybrid]": { "messaging": { "kind": "enterprise-messaging-shared" }}
     }
   }
 }

suppliers/srv/external/API_BUSINESS_PARTNER.js

@@ -1,10 +0,0 @@
-const cds = require('@sap/cds');
-
-module.exports = cds.service.impl(function () {
-  const { A_BusinessPartner } = this.entities;
-
-  // https://api.sap.com/event/SAPS4HANACloudBusinessEvents_BusinessPartner/resource
-  this.after('UPDATE', A_BusinessPartner, async data => {
-    await this.emit("BusinessPartner.Changed", { BusinessPartner: data.BusinessPartner });
-  });
-});

suppliers/test/index.cds

@@ -0,0 +1 @@
+using from '../srv/mashup';

suppliers/test/mocked.js

@@ -0,0 +1,7 @@
+let { API_BUSINESS_PARTNER:S4 } = cds.services
+
+// Mocking event emitter according to:
+// https://api.sap.com/event/SAPS4HANACloudBusinessEvents_BusinessPartner/resource
+S4.after ('UPDATE', 'A_BusinessPartner', data =>
+  S4.emit ('BusinessPartner.Changed', { BusinessPartner: data.BusinessPartner })
+)