unique booking id

src/controllers/tankersController.js

@@ -109,6 +109,11 @@ exports.tankerBooking = async (req, reply) => {
     const count = bookingCount.toString().padStart(4, '0')
     const bookingId = `ARM${year}${month}${day}${count}`
     bookingCount = (bookingCount + 1) % 100;
+    var booking_id = await Tankerbooking.findOne({ bookingid: bookingId})
+    if(booking_id){
+      throw new Error('booking_id already exists');
+              }
+    else {
    
     bookingsData = {
       bookingid : bookingId,
@@ -116,7 +121,6 @@ exports.tankerBooking = async (req, reply) => {
       capacity: req.body.capacity,
       address: req.body.address,
       dateTime: req.body.dateTime,
-      amount :req.body.amount
 
     };
  
@@ -133,7 +137,7 @@ exports.tankerBooking = async (req, reply) => {
       tankersBookingData.dateTime = usertobeInserted.dateTime;
     
 
-
+    }
   }
   
     const booking_data = await tankersBookingData.save();