Initial Version

server/middlewares/helpers/createNotification.js

@@ -0,0 +1,33 @@
+const Notification = require("../../models/Notification")
+const SocketMapping = require("../../models/SocketMapping")
+const {dropRight} = require("lodash")
+module.exports = async (io, adminId,notificationObj) => {
+    //notify to the admin through socket.io
+    //first save notification
+    let notificationObjOfAdmin = await Notification.findOne({ admin:adminId })
+    if (!notificationObjOfAdmin) {
+        // create new notification
+        notificationObjOfAdmin = new Notification({
+            admin:adminId,
+            notifications: [notificationObj],
+            noOfUnseen: 1
+        })
+        await notificationObjOfAdmin.save()
+    } else {
+        let notifications = notificationObjOfAdmin.notifications
+        notifications.unshift(notificationObj)
+        notificationObjOfAdmin.noOfUnseen += 1
+        if (notificationObjOfAdmin.noOfUnseen < 20 && notifications.length > 20) {
+            notificationObjOfAdmin.notifications = dropRight(notifications, notifications.length - 20 )
+        }
+        await notificationObjOfAdmin.save()
+    }
+    //now notifying to the admin    
+    let socketUser = await SocketMapping.find({ user:adminId })
+    if (socketUser.length) {
+        //for every same login user emit notification
+        socketUser.forEach(u => {
+            io.to(u.socketId).emit('notification', { noOfUnseen: notificationObjOfAdmin.noOfUnseen });
+        })
+    }
+}