如何使用 Firestore 在 Cloud Functions for Firebase 中获取服务器时间戳? [英] How do I get the server timestamp in Cloud Functions for Firebase with Firestore?

问题描述

如何在不使用实时数据库的情况下获取服务器时间戳而是使用 Firestore ?

How can we get a server timestamp, without using the realtime database but using instead Firestore ?

import * as functions from 'firebase-functions'
import { Firestore } from '@google-cloud/firestore'

const db = new Firestore()

export let testIfMatch = functions.firestore
        .document('users/{userId}/invites/{invitedUid}')
        .onCreate(event => {
            let invite = <any>event.data.data()

            if (invite.accepted == true) {
              return db.collection('matches').add({
                friends: [userId, invitedUid],
                timestamp: doc.readTime // <--- not exactly the actual time
              })
            }

推荐答案

使用服务器时间戳与 Firestore 有点不同:

Use server timestamp with Firestore is little different:

// Get the `FieldValue` object
var FieldValue = require("firebase-admin").FieldValue;

// Create a document reference
var docRef = db.collection('objects').doc('some-id');

// Update the timestamp field with the value from the server
var updateTimestamp = docRef.update({
    timestamp: FieldValue.serverTimestamp()
});

如果它不起作用，您可以使用 var FieldValue = require("firebase-admin").firestore 编辑 var FieldValue = require("firebase-admin").FieldValue;.字段值；

if it's not working you can edit the var FieldValue = require("firebase-admin").FieldValue; with var FieldValue = require("firebase-admin").firestore.FieldValue;

这篇关于如何使用 Firestore 在 Cloud Functions for Firebase 中获取服务器时间戳?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！