如何从 pub 子函数更新 Firestore 字段

Question

我已经设置了一个 pub/sub 函数来每分钟触发一次，我想检查当前时间是否等于任何 Firestore 实体的开始时间，然后更改一个值：

exports.updateDraftStatus = (event, context) => {
  const pubsubMessage = event.data;
  console.log(Buffer.from(pubsubMessage, 'base64').toString());

  const db = admin.firestore();
  time = admin.firestore.Timestamp.fromMillis(Date.now())
  const snap = db.collection("leagues").where("startTime", time).get()
  await Promise.all(snap.docs.map(doc => doc.ref.update({Started: 'Off'})));
};

Answer 1

.get() method 返回 Promise<QuerySnapshot>，而不是 QuerySnapshot。您需要await 快照，或使用then() 块。

exports.updateDraftStatus = async (event, context) => {
  const pubsubMessage = event.data;
  console.log(Buffer.from(pubsubMessage, 'base64').toString());

  const db = admin.firestore();
  time = admin.firestore.Timestamp.fromMillis(Date.now())
  const snap = await db.collection("leagues").where("startTime", time).get()
  await Promise.all(snap.docs.map(doc => doc.ref.update({Started: 'Off'})));
};

或

exports.updateDraftStatus = (event, context) => {
  const pubsubMessage = event.data;
  console.log(Buffer.from(pubsubMessage, 'base64').toString());

  const db = admin.firestore();
  time = admin.firestore.Timestamp.fromMillis(Date.now())
  return db.collection("leagues").where("startTime", time).get().then((snap) => {
    return Promise.all(snap.docs.map(doc => doc.ref.update({Started: 'Off'})));
  })
};