将查询快照中的文档作为JSON字符串Firestore返回 [英] Return documents in query snapshot as json string firestore

问题描述

我在节点中进行了一个查询以存储到Firestore以获取文档集合.我想将集合写为要由应用程序解析的json字符串.我的代码如下:

I have a query made in node to firestore to get a collection of document. I want to write the collection as a json string to be parsed by an application. My code is as follows:

serverRef = db.collection('servers');
        getDocs = serverRef.where('online', '==', true).get()
        .then(querySnapshot => {
            if (querySnapshot.empty) {
                res.send("NO SERVERS AVAILABLE");
            } else {
                var docs = querySnapshot.docs;
                console.log('Document data:', docs);
                res.end(JSON.stringify({kind: 'freeforge#PublicServerSearchResponse',servers: docs}));
            }

我以这种方式获取不必要的数据，因为我得到的只是文档快照.如何遍历文档快照并将其发送到一个json字符串中?

I get unnecessary data this way as all I get is document snapshots. How do I loop through the document snapshots and send them in one json string?

推荐答案

QuerySnapshot 和 Document 类不是简单的JSON类型.如果要控制所写内容，则需要遍历 querySnapshot (使用 map 或 forEach )并提取JSON数据以用于你自己.

The QuerySnapshot and Document classes are not simple JSON types. If you want to control what is written, you'll need to loop over querySnapshot (with map or forEach) and extract the JSON data for yourself.

一个可能的例子:

serverRef = db.collection('servers');
getDocs = serverRef.where('online', '==', true).get()
.then(querySnapshot => {
    if (querySnapshot.empty) {
        res.send("NO SERVERS AVAILABLE");
    } else {
        var docs = querySnapshot.docs.map(doc => doc.data());
        console.log('Document data:', docs);
        res.end(JSON.stringify({kind: 'freeforge#PublicServerSearchResponse', servers: docs}));
    }
});

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