是否可以在Firestore Cloud Function中获取所有文档?

问题描述：

我想使用云函数更新集合中所有文档的值，因为它们取决于创建日期，但是通过Cloud Firestore触发器示例来看，似乎所有事件只能访问单个文档.有没有办法遍历所有文档?

I want to update a value on all documents in a collection using cloud functions as they are dependent on the creation date, but looking through the Cloud Firestore Triggers examples it looks like all events are only able to access a single document. Is there a way to loop over all documents?

答

您通常会在Cloud Functions代码中使用Admin SDK.一旦有了它，就可以照常阅读该集合了.在从集合中读取所有文档时，请查看 firebase文档中的节点示例. :

You'd typically use the Admin SDK for that in your Cloud Functions code. Once you have that, it's a matter of read the collection as usual. Check the node examples in the firebase documentation on reading all documents from a collection:

const admin = require('firebase-admin');

admin.initializeApp({
    credential: admin.credential.applicationDefault()
});

var db = admin.firestore();

var citiesRef = db.collection('cities');
var allCities = citiesRef.get()
    .then(snapshot => {
        snapshot.forEach(doc => {
            console.log(doc.id, '=>', doc.data());
        });
    })
    .catch(err => {
        console.log('Error getting documents', err);
    });

是否可以在Firestore Cloud Function中获取所有文档?

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