Cleaned up delegation

reviews/test/bookshop/server.js

@@ -10,21 +10,19 @@ cds.on('listening', async()=>{
         console.debug ('> received:', msg.event, msg.data)
         const { Books } = db.entities('sap.capire.bookshop')
         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})
+        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 (() => {
-        CatalogService.on ('READ', 'Books/reviews', (req) => {
-            const { Reviews } = ReviewsService.entities
-            const [ subject ] = req.params
-            const tx = ReviewsService.transaction (req)
-            return tx.run (SELECT.from (Reviews) .where ({subject}))
-        })
-    })
+    CatalogService.impl (srv => srv.on ('READ', 'Books/reviews', (req) => {
+        console.debug ('> delegating to ReviewsService')
+        const { Reviews } = ReviewsService.entities
+        const [ subject ] = req.params
+        const tx = ReviewsService.tx (req)
+        return tx.read (Reviews,{subject}) .columns (req.query.SELECT.columns)
+    }))
 
 })
 

reviews/test/requests.http

@@ -5,10 +5,12 @@
 
 
 ### Request to CatalogService > delegated to ReviewsService
-GET http://localhost:4004/browse/Books(201)/reviews
+GET http://localhost:4004/browse/Books(201)/reviews?
+&$select=rating,date,reviewer,title
 
 ### Alternative OData URL
-GET http://localhost:4004/browse/Books/201/reviews
+GET http://localhost:4004/browse/Books/201/reviews?
+&$select=rating,date,reviewer,title
 
 ###
 GET http://localhost:4004/browse/Books(201)?