Question

我想使用云功能更新分数

到目前为止，我已经尝试过了

exports.rate = functions.https.onRequest((request, response) => {
  admin
.firestore()
.collection()
.where("index", "==", request.index)
.get()
.then(snap => {
  snap.forEach(x => {
    const newRating = x.data().score + request.value;
    firebase
      .firestore()
      .collection()
      .doc(x.id)
      .update({ score: newRating });
  });
});
});

Answer 1

以下方法应该起作用：

exports.rate = functions.https.onRequest((request, response) => {
    admin
        .firestore()
        .collection('someName') //IMPORTANT! You need to identify the collection that you want to query
        .where('index', '==', request.index)
        .get()
        .then(snap => {
            let batch = admin.firestore().batch();
            snap.forEach(x => {
                const newRating = x.data().score + request.value;
                const ratingRef = admin  //here use admin.firestore() and not firebase.firestore() since in a Cloud Function you work with the Admin SDK
                    .firestore()
                    .collection('someOtherName')  //You need to identify the collection
                    .doc(x.id);
                batch.update(ratingRef, { score: newRating });
            });
            // Commit and return the batch
            return batch.commit();
        })
        .then(() => {
            response.send({result: 'success'});
        })
        .catch(error => {
            response.status(500).send(error);
        });
});

您需要标识要查询的集合或要在其中更新文档的集合，请参见https://firebase.google.com/docs/firestore/query-data/queries和https://firebase.google.com/docs/reference/js/firebase.firestore.DocumentReference#collection。换句话说，您不能

admin.firestore（）。collection（）。where（...）

不将值传递给collection()

您需要在最后发送回复，请参见官方视频系列中的以下视频：https://www.youtube.com/watch?v=7IkUgCLr5oA
最后，您应该使用批量写入，因为您要并行更新多个文档，请参见https://firebase.google.com/docs/firestore/manage-data/transactions#batched-writes和https://firebase.google.com/docs/reference/js/firebase.firestore.WriteBatch

如何使用云功能更新收藏集？

1 个答案: