在Firebase函数中使用映射时出现问题

Question

我正在尝试获取Map的长度，但我一直在获取"未定义"；。有人能告诉我我做错了什么吗？

这是代码中给我带来问题的部分。

const GYMdetail: { [key: string]: number} = {};
GYMdetail[`${doc.data().name} (${doc.data().personalID})`] = 650;
const subtotal = 650 * GYMdetail.size;

这是完整的功能代码

export const addGymMonthlyExpense =
functions.https.onRequest((request, response) => {
const query1 = admin.firestore().collection("users");
const query = query1.where("subscriptions.gym.active", "==", true);
query.get()
.then(async (allUsers) => {
allUsers.docs.forEach(async (doc) => {
if (doc != undefined) {
const houseForGym = doc.data().subscriptions.gym.house;
await admin.firestore()
.doc(`houses/${houseForGym}/expenses/2022-04`)
.get().then((snapshot) => {
if (snapshot.data() == undefined) {
console.log(`${houseForGym}-${doc.data().name}: CREAR!!`);
} else if (snapshot.data()!.issued == false) {
let detail: { [key: string]: any} = {};
const GYMdetail: { [key: string]: number} = {};
detail = snapshot.data()!.detail;
GYMdetail[
`${doc.data().name} (${doc.data().personalID})`
] = 650;
const subtotal = 650 * GYMdetail.size;

detail["GYM"] = {"total": subtotal, "detail": GYMdetail};
snapshot.ref.set({"detail": detail}, {merge: true});
}
return null;
})
.catch((error) => {
console.log(
`${houseForGym} - ${doc.data().name}: ${error}`);
response.status(500).send(error);
return null;
});
}
});
response.send("i");
})
.catch((error) => {
console.log(error);
response.status(500).send(error);
});
});

Answer 1

由于您在代码中执行对数据库的异步调用，因此需要从顶级代码返回promise；否则，当最终的}执行时，云函数可能会杀死容器，到那时数据库加载还没有完成。

因此：

export const addGymMonthlyExpense =
functions.https.onRequest((request, response) => {
const query1 = admin.firestore().collection("users");
const query = query1.where("subscriptions.gym.active", "==", true);
return query.get()
...

接下来，您需要确保所有嵌套的get()调用也有机会在函数容器终止之前完成。为此，我建议不要对每个嵌套的get调用使用await，而是对所有调用使用单个Promise.all：

query.get()
.then(async (allUsers) => {
const promises = [];
allUsers.docs.forEach((doc) => {
const houseForGym = doc.data().subscriptions.gym.house;
promises.push(admin.firestore()
.doc(`houses/${houseForGym}/expenses/2022-04`)
.get().then((snapshot) => {
...
});
});
response.send("i");
return Promise.all(promises);
})
.catch((error) => {
console.log(error);
response.status(500).send(error);
});