Specify Id of document in RXFirestore

Is it possible to specify the id of the documents we create via RXFirestore.addDocument()? I find this very useful feature missing. Could someone help show how to do it?

[juliender]

Thanks ! But not. But I found ! After hours of struggling. I forked the repo and found in javadoc setDocument that

if the document does not yet exist, it will be created.

Wonderful. Here is the result.

public static Maybe<User> getUser(){
    FirebaseFirestore db = FirebaseFirestore.getInstance();
    return RxFirebaseAuth.signInAnonymously(FirebaseAuth.getInstance())
            .flatMap(authResult -> {

                DocumentReference userRef = db.collection("users").document(authResult.getUser().getUid());
                User user = new User(authResult.getUser().getUid());

                return RxFirestore.getDocument(userRef, User.class)    // get user
                        .switchIfEmpty(RxFirestore.setDocument(userRef, user).toMaybe());   // update user if does not exist
            });
}

I can now create users documents named with the authentication user ID, so no need to use queries, everything is very simple.

Thanks again for your help

[FrangSierra]

AddDocument recieve a Document or CollectionReference. You just need to create the ID before and add it to your new reference before call AddDocument

val newFollowedUserId = firestore.collection(PUBLIC_PROFILE).document(uid).collection(FOLLOWING).document()

RxFirestore.addDocument(firestore.collection(PUBLIC_PROFILE).document(uid).collection(FOLLOWING).document(newFollowedUserId)).subscribe()