Firestore Cloud Function空集合 [英] Firestore Cloud Function empty collection

问题描述

我有一个困扰我好几天的问题.我正在尝试创建一个从Firestore数据库读取的Firebase Cloud函数.

I have a problem that's bugging me for days. I am trying created a Firebase Cloud function that reads from the Firestore database.

我的Firestore数据库如下:

My Firestore DB looks like this:

问题是我无法像这样列出用户:

Problem is that I cannot list users like this:

db.collection('users').get().then((snapshot) => snapshot.forEach(...));

如果我尝试执行此操作，则会得到空响应，例如 users 集合中没有用户.

If I try to do this I get empty response, like there are no users in my users collection.

但是我尝试直接访问用户，这是可行的:

But I try to access user directly it works:

await db.collection('users/5CZxgu8nmNXu2TgplwOUdOIt8e33/receipts').get()

我的完整代码:

import * as functions from 'firebase-functions';

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

exports.cat = functions.https.onRequest(async (req, res) => {
    const receiptList: any = [];
    const db: Firestore = admin.firestore();

    const usersRef = await db.collection('users').get();
    console.log(usersRef.empty);        // Returns true

    const receiptsRef = await db
        .collection('users/5CZxgu8nmNXu2TgplwOUdOIt8e33/receipts')
        .get();

    receiptsRef.forEach((receipt: any) => {
        console.log(receipt);
        receiptList.push(receipt);
        // Here I can access data
    });

    res.send(receiptList);
    return '';
});

有人知道我在做什么错吗?谢谢！

Does anyone have any idea what I'm doing wrong? Thank you!

推荐答案

您的用户集合实际上为空.看到文档ID如何以斜体显示?这意味着实际上并没有文档，但是，有一些子集合，这些子集合的下面组织着文件.

Your users collection is actually empty. See how the document IDs are shown in italics? That means there is not actually a document in its place, however, there are subcollections with documents organized underneath them.

查询集合时，只会获取该集合中紧接的文档.查询将不会拾取按子集合组织的文档.在这方面，查询被称为浅".如您所见，您需要更深入地了解子集合以获取其文档.

When you query a collection, you only get the documents that are immediately within that collection. A query will not pick up documents organized in subcollections. In this respect, queries are said to be "shallow". As you've seen, you need to reach deeper into the subcollection to get its documents.

最重要的是，您所显示的查询确实在执行其应做的事情.

Bottom line is that the queries you're showing are doing exactly what they're supposed to do.

这篇关于Firestore Cloud Function空集合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！