Adding Custom Logic

srv/services.js

@@ -0,0 +1,23 @@
+const cds = require('@sap/cds')
+
+class ProcessorService extends cds.ApplicationService {
+  /** Registering custom event handlers */
+  init() {
+    this.before("UPDATE", "Incidents", (req) => this.onUpdate(req));
+    this.before("CREATE", "Incidents", (req) => this.changeUrgencyDueToSubject(req.data));
+
+    return super.init();
+  }
+
+  changeUrgencyDueToSubject(data) {
+    let urgent = data.title?.match(/urgent/i)
+    if (urgent) data.urgency_code = 'H'
+  }
+
+  /** Custom Validation */
+  async onUpdate (req) {
+    let closed = await SELECT.one(1) .from (req.subject) .where `status.code = 'C'`
+    if (closed) req.reject `Can't modify a closed incident!`
+  }
+}
+module.exports = { ProcessorService }