Separated reviewed and reviews

reviewed/server.js

@@ -0,0 +1,55 @@
+////////////////////////////////////////////////////////////////////////////
+//
+//   This is an example of using a project-local server.js to intercept
+//   the default bootstrapping process.
+//
+
+const cds = require ('@sap/cds')
+
+// Mashup services after all are served...
+cds.once('served', async()=>{
+
+    // react on event messages from reviews service
+    const ReviewsService = await cds.connect.to ('ReviewsService')
+    const db = await cds.connect.to ('db')
+
+    // reflect entities required below...
+    const { Books } = db.entities('sap.capire.bookshop')
+    const { Reviews } = ReviewsService.entities
+
+    ReviewsService.on ('reviewed', (msg) => {
+        console.debug ('> received:', msg.event, msg.data)
+        const { subject, rating } = msg.data
+        const tx = db.tx (msg) // TODO: db.tx(msg) fully implemented?
+        return tx.update (Books,subject) .with ({rating})
+    })
+
+    // delegate requests to read reviews to ReviewsService
+    const CatalogService = await cds.connect.to ('CatalogService')
+    CatalogService.impl (srv => srv.on ('READ', 'Books/reviews', (req) => {
+        console.debug ('> delegating to ReviewsService')
+        const [ id ] = req.params
+        const tx = ReviewsService.tx(req)
+        return tx.read (Reviews) .where ({ subject: String(id) })
+        .columns (req.query.SELECT.columns)
+    }))
+
+})
+
+// Other bootstrapping events you could hook in to...
+/* eslint-disable no-unused-vars */
+cds.on('bootstrap',(app) => {/* ... */})
+cds.on('loaded', (model) => {/* ... */})
+cds.on('connect', (srv) => {/* ... */})
+cds.on('serving', (srv) => {/* ... */})
+cds.once('listening', ({server,url}) => {/* ... */})
+
+
+// Delegate bootstrapping to built-in server.js
+module.exports = cds.server
+
+// Monkey-patching older releases
+if (cds.version < '3.33.4') cds.once('listening', ()=> cds.emit('served'))
+
+// Launch server if started directly from command-line
+if (!module.parent)  cds.server()