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