I want to save a same string in my all documents of a collection

Question

I have created a application using Firestore in this app I want to save a same string in all documents of a collection in one click

For Example: See in the image. I hav

Answer 1

To achieve this, please use the following code:

CollectionReference linksRef = rootRef.collection("Links");
linksRef.get().addOnCompleteListener(new OnCompleteListener() {
    @Override
    public void onComplete(@NonNull Task task) {
        if (task.isSuccessful()) {
            for (QueryDocumentSnapshot document : task.getResult()) {
                Map map = new HashMap<>();
                map.put("propertyName", "propertyValue");
                placesRef.document(document.getId()).update(map);
            }
        }
    }
});

All your documents will have now a new propertyName property that will hold the value of propertyValue.