在Firestore中一步添加呼叫时如何获取ID? [英] How to get the id when call add in one step in Firestore?

问题描述

我知道要获取ID:

String cityId = db.collection("cities").document().getId();
db.collection("cities").document(cityId).set(city);

但是更容易:

db.collection("cities").add(city);

但是如何获取ID? .add(city).getId()无效.文档中没有信息.

But how to get id? It not work .add(city).getId(). No information in docs.

推荐答案

在Firestore中一步添加呼叫时如何获取ID?

How to get the id when call add in one step in Firestore?

无法像使用 document()调用时那样一步一步地获得文档ID.为了解决这个问题，您应该添加一个完整的侦听器.试试这个:

There is no way in which you can get the document id in a single step, as you do when using a document() call. To solve this, you should add a complete listener. Try this:

db.collection("cities").add(city).addOnCompleteListener(new OnCompleteListener<DocumentReference>() {
    @Override
    public void onComplete(@NonNull Task<DocumentReference> task) {
        if (task.isSuccessful()) {
            DocumentReference document = task.getResult();
            if (document != null) {
                String id = document.getId(); //Do what you need to do with the document id
                Log.d(TAG, id);
            }
        }
    }
});

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