Hello there
You can solve this issue by transforming the array of objects into a simple array of values that FQL functions on.
like this
const orders = Order.all();
const orderIds = orders.map(order => order.orderid);
const maxOrderId = Math.max(…orderIds);
const newOrderId = maxOrderId + 1;
Apply this method. I hope this will be helpful for you.
For more information Remove item from nested array