使用JS中的云函数将数据设置到Firestore

Question

创建新用户后，我想向Firestore中的新集合添加数据。

我已将我的职能设置为这样；

exports.createUser = functions.firestore.document('Users/{userId}')
    .onCreate((snap, context) => {
        const newValue = snap.data();
        if (snap.data() === null) return null;
        const userRef = context.params.userId
        console.log("create user found " + (userRef))
        let notificationCollectionRef = firestoreDB.collection('Users').document(userRef).collection('Notifications')
        let notificationDocumentRef = notificationCollectionRef.document('first notification')
        return notificationDocumentRef.set({
            notifications: "here is the notificiation"
        }, {merge: true});
});

当运行该函数时，我得到控制台日志正确地打印出userId，但我得到以下错误；

类型错误：firestoreDB。集合（…）。文档不是导出时的函数。createUser。功能。消防商店。文件在对象上创建（/user\u code/index.js:23:73）。（/user_code/node_modules/firebase functions/lib/cloud functions.js:112:27）在下一个（本地）at/user_code/node_modules/firebase functions/lib/cloud functions。js:28:71在cloudFunction（/user\u code/node\u modules/firebase functions/lib/cloud functions.js:24:12）在cloudFunction（/user\u code/node\u modules/firebase functions/lib/cloud functions.js:82:36）在/var/tmp/worker/worker。js:728:24在程序中_tickDomainCallback（内部/process/next_tick.js:135:7）

我是新来的JS

Answer 1

以下是完整的工作代码：

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

const firestoreDB = admin.firestore()

// Create and Deploy Your First Cloud Functions
// https://firebase.google.com/docs/functions/write-firebase-functions

exports.helloWorld = functions.https.onRequest((request, response) => {
 response.send("Hello from Firebase Cloud Functions!");
 console.log("function triggered")
});

exports.createUser = functions.firestore.document('Users/{userId}')
    .onCreate((snap, context) => {
        const newValue = snap.data();
        if (snap.data() === null) return null;
        const uid = context.params.userId
        let notificationCollectionRef = firestoreDB.collection('Users').doc(uid).collection('Notifications')
            return notificationCollectionRef.add({
                notification: 'Hello Notification',
                notificationType: 'Welcome'
            }).then(ref => {
               return console.log('notification successful', ref.id)
            })
        });

Answer 2

firestoreDB。集合（“用户”）返回一个CollectionReference对象。您试图调用名为document（）的方法，但是从API文档中可以看到，没有这样的方法。我想您打算使用doc（）来构建DocumentReference。

    let notificationCollectionRef = firestoreDB.collection('Users').doc(userRef).collection('Notifications')
    let notificationDocumentRef = notificationCollectionRef.doc('first notification')