在文档参考上使用set()，update()，delete()时，Firestore WriteBatch无法执行 [英] Firestore WriteBatch Fails to execute when using set(), update(), delete() on Document Reference

问题描述

我正在使用 Firestore 作为后端构建一个 Android 应用程序.我正在写文档中的多个集合，在某些情况下可以写到文档中， update 文档，然后删除所有文档在同一 WriteBatch 中.每当用户创建时，以后在相同的 WriteBatch 中，删除文档都会使我的应用程序崩溃.下面是我收到的代码和错误.

I am building an Android application using Firestore as my backend. I am writing to multiple collections within a document, and in some instances can write to a document, update the document, then delete the document all within the same WriteBatch. Whenever a user creates, then later deletes a document within the same WriteBatch my application crashes. Below is the code and error I receive.

private void executeBatchedWrite() {
    WriteBatch batch = db.batch();

    DocumentReference doc = notebookRef.document("123");
    batch.set(doc, new Note("New Note", "New Note", 1));

    batch.update(doc, "timestamp", FieldValue.serverTimestamp());

    batch.delete(doc);

    batch.commit();
}

我的应用程序崩溃，并且出现以下错误:

My app crashes and I receive the following error:

java.lang.RuntimeException: Internal error in Firestore (0.6.6-dev).
    at com.google.firebase.firestore.g.zza.zzb(SourceFile:324)
    at com.google.firebase.firestore.g.zzd.run(Unknown Source)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)

推荐答案

我已经确定这是一个错误，并将其报告给了Google.进一步的测试表明，此问题可能是特定于将FieldValue.serverTimestamp()写入文档的，最终将在同一批写入中将其删除.如果将FieldValue.serverTimestamp()替换为其他值(例如:System.currentTimeMillis())，则问题似乎消失了.

I've determined this was a bug and reported it to Google. Further testing indicates that this issue may be specific to writing FieldValue.serverTimestamp() to a document that will eventual be deleted within the same batch write. If the FieldValue.serverTimestamp() is replaced with a different value (ex: System.currentTimeMillis()), the issue seems to go away.

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