02ea798f5f
* Streamlined eslint usage * import from @sap/cds instead of @sap/cds/lib * Using @sap/cds/eslint.js * eslint.config.mjs aktualisieren * Adjusted eslint usage for eslint9 with cds8
38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
const cds = require ('@sap/cds')
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class OrdersService extends cds.ApplicationService {
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/** register custom handlers */
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init(){
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const { 'Orders.Items':OrderItems } = this.entities
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this.before ('UPDATE', 'Orders', async function(req) {
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const { ID, Items } = req.data
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if (Items) for (let { product_ID, quantity } of Items) {
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const { quantity:before } = await cds.tx(req).run (
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SELECT.one.from (OrderItems, oi => oi.quantity) .where ({up__ID:ID, product_ID})
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)
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if (quantity != before) await this.orderChanged (product_ID, quantity-before)
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}
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})
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this.before ('DELETE', 'Orders', async function(req) {
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const { ID } = req.data
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const Items = await cds.tx(req).run (
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SELECT.from (OrderItems, oi => { oi.product_ID, oi.quantity }) .where ({up__ID:ID})
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)
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if (Items) await Promise.all (Items.map(it => this.orderChanged (it.product_ID, -it.quantity)))
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})
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return super.init()
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}
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/** order changed -> broadcast event */
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orderChanged (product, deltaQuantity) {
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// Emit events to inform subscribers about changes in orders
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console.log ('> emitting:', 'OrderChanged', { product, deltaQuantity }) // eslint-disable-line no-console
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return this.emit ('OrderChanged', { product, deltaQuantity })
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}
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}
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module.exports = OrdersService
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