如何在 Firestore -Flutter 中将所有文档从一个集合复制到另一个集合？

Question

I am in a situation where when a users makes a payment, his cart products Stored in Firestore collection (CartProducts) should be moved to new collection Called SuccessFullOrders .

So my Basic Question is how to move all documents from one collection to Firestore other Collection in Flutter

I don't Know how to write code for this in flutter.Thanks for your Answers

Here's my Code

void _onPressed()async {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  FirebaseUser user = await _auth.currentUser();
  print(user.uid);
  firestorInstance.collection("users").getDocuments().then((querySnapshot) {
    querySnapshot.documents.forEach((result) {
      firestorInstance.collection("users").document(user.uid).collection("CartProducts").getDocuments().then((querySnapshot) {
        querySnapshot.documents.forEach((result) {

          //what to write here so that new documents would be created in other collection 

          print(result.data);
        });
      });
    });
  });
}

Answer 1

Currently there's no way to copy a collection into another provided by firebase officially. And, for sure, you can iterate over your previous collection & create new documents in the other.

In your case you should be doing something like:

userFirebaseInstance
    .collection(NewCollection)
    .document()
    .setData(YourDataHere)