Duplicate records are created in case of concurrent requests - php

Question

I have two tables orders and driver_orders.The sample code is :
DB::beginTransaction();
try{
//check if the order status is pending.If the status is other than pending then one of the driver has accepted the order.
$fetch_order = $this->order->where([
['id',$id],
['status','pending']
])->lockForUpdate()->first();
if(!fetch_order){
throw new Exception('Order is already assigned to another driver.');
}
$driver_id = Auth::id();
//checks if logged in driver has pending order to be delivered.
$check_user_pending_order = $this->driver_order->where([
['driver_id', $driver_id ],
['status','!=','delivered']
])->lockForUpdate()->first();
if($check_user_pending_order){
throw new Exception('You have pending order to be delivered.');
}
$data['order_id'] = $fetch_order->id;
$data['driver_id'] = $driver_id;
$data['amount'] = $fetch_order->amount;
$data['status'] = 'assigned';
//create record in driver_order table
$this->driver_order->create($array);
//update the status in order table
$fetch_order->update([
'status' => 'assigned'
]);
DB::commit();
return response()->json([
'status' => '200',
'message' => 'Order successfully assigned. Get ready to deliver the order.'
]);
}
catch(\Exception $ex){
return response()->json([
'status' => '403',
'message' => $ex->getMessage()
],403);
}
The issue is I am getting concurrent request which tends to create duplicate records for the same order in driver_orders table. I used the locking but it does not solve the problem as well. Please suggest me the way to tackle the above mention issue.