如何使用云功能将新数据推送到Firebase实时数据库中? [英] How to push new data into firebase realtime database using cloud functions?

问题描述

每次调用该函数时，如何使用Cloud函数更改Firebase数据库中的实时数据?我有一个名为Points的数据单元，我想在每次部署函数时将Points的值更改为1到10之间的随机数.我真的是刚开始使用Firebase，所以我不知道从哪里开始.我看了提供的大多数文档，但没有一个提供帮助.我尝试了一些尝试，但失败了.请帮助

How can I use a Cloud function to change realtime data in my firebase database every-time the function is called? I have a data cell called Points and I want to change the value of Points into a random number between 1 and 10 every time the function is deployed. I am really new to using firebase so I wouldn't know where to really start. I have looked most of the documentation provided but none of them helped. I have tried a few things but failed miserably. Please help

谢谢

这就是我尝试过的...

This is what I tried...

exports.userVerification = functions.database.ref('Points')

var ref = database().ref('Points')

var number = (Math.floor(Math.random() * 10) + 1)*10

ref.update(number)

推荐答案

您将在

You will find in the documentation all the details on how to trigger a Cloud Function via Pub/Sub.

您还将在官方的Cloud Functions示例中找到一个非常简单的"Hello World"示例:

You will also find a very simple "Hello World" example in the official Cloud Functions sample: https://github.com/firebase/functions-samples/tree/master/quickstarts/pubsub-helloworld

您的云函数将如下所示:

Your Cloud Function would then look like the following:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.randomNbr = functions.pubsub.topic('topic-name').onPublish((message) => {

      var ref = admin.database().ref();

      var number = Math.floor(Math.random() * (10)) + 1;

      return ref.update({ Points: number });

});

请注意，我们返回由 update()异步方法返回的Promise，以便向平台指示工作已完成.我建议您观看Firebase视频系列中有关"JavaScript承诺"的3个视频:https://firebase.google.com/docs/functions/video-series/

Note that we return the Promise returned by the update() asynchronous method, in order to indicate to the platform that the work is finished. I would suggest you watch the 3 videos about "JavaScript Promises" from the Firebase video series: https://firebase.google.com/docs/functions/video-series/

还请注意，您不能简单地执行 ref.update(number); :您将得到一个错误( Error:Reference.update failed:第一个参数必须是包含以下内容的对象:要替换的子项.)

Note also that you cannot simply do ref.update(number);: you'll get an error (Error: Reference.update failed: First argument must be an object containing the children to replace.)

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