How to copy one collection document id to another collection field in Cloud Firestore using Flutter?

Question

I want to copy Users collection documentid to Orders collection driverId . Please Help

Answer 1

The function should be this.

void _setDriverId(){
    String userDocumentId = 'your_user_id';
    String orderDocumentId = 'your_target_order_id';
    FirebaseFirestore.instance.collection('Orders').doc(orderDocumentId)
       .update({'driverId': userDocumentId})
       .catchError((e) => print(e.toString()));
}