Firebase 函数问题：（未定义）对象不可迭代（无法读取属性 Symbol(Symbol.iterator)）答案

【问题标题】：Firebase Functions trouble: (undefined) object is not iterable (cannot read property Symbol(Symbol.iterator))Firebase 函数问题：（未定义）对象不可迭代（无法读取属性 Symbol(Symbol.iterator)）
【发布时间】：2021-02-20 14:20:24
【问题描述】：

我在运行 User onDelete Firebase Cloud Function 时收到错误 Error in function [undefined:: object is not iterable (cannot read property Symbol(Symbol.iterator))]（我在函数中输入了错误），它是我的 User onCreate 函数的近镜像（就像一个魅力）：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const FS = admin.firestore();
const FA = admin.auth();

exports.newUser = functions.auth.user().onCreate(async(user)=>{
    const fTime = admin.firestore.Timestamp.now()
    const day = fTime.toDate().toLocaleDateString().replace('/','-').replace('/','-')
    const time = fTime.toDate().toLocaleTimeString('en',{hour12:false})+'.'+fTime.toDate().getMilliseconds()
    try {
        const act1 = FS.doc(`users/${user.uid}`).create({email:user.email})
        const act2 = FS.doc(`globalEvents/${day}`).set({[time]:{time:fTime,source:'Function newUser',description:`Account created for [${user.uid} - ${user.email}]`}},{merge:true})
        const promise = await Promise.all(act1,act2)
        return promise
    }
    catch (err) {
        return FS.doc(`globalEvents/${day}`).set({[time]:{time:fTime,source:'Function newUser',description:`Error in function [${err.code}:: ${err.message}]`}},{merge:true})
    }
})

exports.delUser = functions.auth.user().onDelete(async(user)=>{
    const fTime = admin.firestore.Timestamp.now()
    const day = fTime.toDate().toLocaleDateString().replace('/','-').replace('/','-')
    const time = fTime.toDate().toLocaleTimeString('en',{hour12:false})+'.'+fTime.toDate().getMilliseconds()
    try {
        const act1 = FS.doc(`users/${user.uid}`).delete()
        const act2 = FS.doc(`globalEvents/${day}`).set({[time]:{time:fTime,source:'Function delUser',description:`Account deleted for [${user.uid} - ${user.email}]`}},{merge:true})
        const promise = await Promise.all(act1,act2)
        return promise
    }
    catch (err) {
        return FS.doc(`globalEvents/${day}`).set({[time]:{time:fTime,source:'Function delUser',description:`Error in function [${err.code}:: ${err.message}]`}},{merge:true})
    }
})

对于那些使用 Firebase Cloud Functions 识别的人，我有“admin.initializeApp();”在 index.js 中，以及上面由 exports.newUser = users.newUser" & "exports.delUser = users.delUser 链接的 user.js 中

由于我布局它的异步性质（再次，onCreate 完美运行）它仍然会删除用户的文档，但会触发捕获并创建以下文档：

12:48:24.981
description
"Error in function [undefined:: object is not iterable (cannot read property Symbol(Symbol.iterator))]"
source
"Function delUser"
time
November 8, 2020 at 7:48:24 AM UTC-5

【问题讨论】：

标签： javascript firebase google-cloud-functions

【解决方案1】：

这是因为 Promise.all() 接受单个参数，该参数必须是 Promise 的 iterable，例如 Array。

传递一个数组，如下await Promise.all([act1, act2])，而不是await Promise.all(act1,act2)，就可以解决问题了。

【讨论】：