Added reviews/test/bookshop

reviews/test/bookshop/package.json

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+{
+  "name": "@capire/bookshop-with-reviews",
+  "version": "1.0.0",
+  "dependencies": {
+    "@capire/bookshop": "*",
+    "@capire/reviews": "*",
+    "@sap/cds": "^3.31.1",
+    "express": "^4.17.1"
+  },
+  "cds": {
+    "requires": {
+      "db": {
+        "kind": "sql"
+      },
+      "ReviewsService": {
+        "kind": "odata"
+      },
+      "messaging": {
+        "kind": "file-based-messaging"
+      }
+    }
+  }
+}

reviews/test/bookshop/schema.cds

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+//
+//  Extending Books with Reviews
+//
+
+using { sap.capire.bookshop.Books } from '@capire/bookshop';
+using { ReviewsService.Reviews } from '@capire/reviews';
+
+extend Books with {
+  /** Access to detailed collection of Reviews */
+  reviews : Composition of many Reviews on reviews.subject = $self.ID;
+  /** Average rating */
+  rating : Reviews.rating;
+}

reviews/test/bookshop/server.js

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+const cds = require ('@sap/cds')
+
+cds.on('listening', async()=>{
+
+        // connect to requires services
+    const ReviewsService = await cds.connect.to ('ReviewsService')
+    const CatalogService = await cds.connect.to ('CatalogService')
+    const db = await cds.connect.to ('db')
+
+    // import model definitions from connected services to work with subsequently
+    const { Reviews } = ReviewsService.entities
+    const { Books } = db.entities
+
+    // react on event messages from reviews service
+    ReviewsService.on ('reviewed', (msg) => {
+        console.debug ('> received:', msg.event, msg.data)
+        const { subject, rating } = msg.data
+        const tx = db // TODO: db.transaction (msg)
+        return tx.run (UPDATE (Books, subject) .with ({rating}))
+        // return tx.update (Books, subject) .with ({rating})
+    })
+
+    console.log (Reviews.name)
+    // delegate requests to read reviews to ReviewsService
+    CatalogService.impl (srv => {
+        srv.on ('READ', 'Books/reviews', (req) => {
+            const [ subject ] = req.params
+            const tx = ReviewsService.transaction (req)
+            return tx.run (SELECT.from (Reviews) .where ({subject}))
+        })
+    })
+
+})
+
+module.exports = cds.server