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Updated to use srv-to-srv + declared events

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Daniel
2020-10-28 15:14:34 +01:00
committed by Daniel Hutzel
parent d9a06d16f1
commit df55110b9b
4 changed files with 15 additions and 14 deletions
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7
reviews/srv/reviews-service.cds
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@@ -2,10 +2,17 @@ using { sap.capire.reviews as my } from '../db/schema';
service ReviewsService {
// Sync API
entity Reviews as projection on my.Reviews excluding { likes }
action like (review: type of Reviews:ID);
action unlike (review: type of Reviews:ID);
// Async API
event reviewed : {
subject: type of Reviews:subject;
rating: Decimal(2,1)
}
// Input validation
annotate Reviews with {
subject @mandatory;

11
reviews/srv/reviews-service.js
View File

@@ -4,27 +4,26 @@ module.exports = cds.service.impl (async function(){
// Get the CSN definition for Reviews from the db schema for sub-sequent queries
// ( Note: we explicitly specify the namespace to support embedded reuse )
const { Reviews, Likes } = this.entities ('sap.capire.reviews')
const messaging = await cds.connect.to('messaging')
this.before (['CREATE','UPDATE'], 'Reviews', req => {
if (!req.data.rating) req.data.rating = Math.round(Math.random()*4)+1
})
// Emit an event to inform subscribers about new avg ratings for reviewed subjects
this.after (['CREATE','UPDATE','DELETE'], 'Reviews', async(_,req) => {
this.after (['CREATE','UPDATE','DELETE'], 'Reviews', async function(_,req) {
const {subject} = req.data
const {rating} = await cds.transaction(req) .run (
const {rating} = await cds.tx(req) .run (
SELECT.one (['round(avg(rating),2) as rating']) .from (Reviews) .where ({subject})
)
global.it || console.log ('< emitting:', 'reviewed', { subject, rating })
messaging.tx(req).emit ('reviewed', { subject, rating })
this.emit ('reviewed', { subject, rating })
})
// Increment counter for reviews considered helpful
this.on ('like', (req) => {
if (!req.user) return req.reject(400, 'You must be identified to like a review')
const {review} = req.data, {user} = req
const tx = cds.transaction(req)
const tx = cds.tx(req)
return tx.run ([
INSERT.into (Likes) .entries ({review_ID: review, user: user.id}),
UPDATE (Reviews) .set({liked: {'+=': 1}}) .where({ID:review})
@@ -35,7 +34,7 @@ module.exports = cds.service.impl (async function(){
this.on ('unlike', async (req) => {
if (!req.user) return req.reject(400, 'You must be identified to remove a former like of yours')
const {review} = req.data, {user} = req
const tx = cds.transaction(req)
const tx = cds.tx(req)
const affectedRows = await tx.run (DELETE.from (Likes) .where ({review_ID: review,user: user.id}))
if (affectedRows === 1) return tx.run (UPDATE (Reviews) .set ({liked: {'-=': 1}}) .where ({ID:review}))
})