我正在创建一个推送通知应用程序,我使用node.js来部署firebase功能,但是在部署时显示错误。
warning Avoid nesting promises promise/no-nesting
warning Avoid nesting promises promise/no-nesting
error Each then() should return or throw promise/always-return
这是我的代码:
"use-strict";
const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp(functions.config().firebase);
exports.sendNotification = functions.firestore
.document("Users/{user_id}/Notification/{notification_id}")
.onWrite(event => {
const user_id = event.params.user_id;
const notification_id = event.params.notification_id;
return admin
.firestore()
.collection("Users")
.doc(user_id)
.collection("Notification")
.doc(notification_id)
.get()
.then(queryResult => {
const from_user_id = queryResult.data().from;
const from_message = queryResult.data().message;
const from_data = admin
.firestore()
.collection("Users")
.doc(from_user_id)
.get();
const to_data = admin
.firestore()
.collection("Users")
.doc(user_id)
.get();
return Promise.all([from_data, to_data]).then(result => {
const from_name = result[0].data().name;
const to_name = result[1].data().name;
const token_id = result[1].data().token_id;
const payload = {
notification: {
title: "Notification From :" + from_name,
body: from_message,
icon: "default"
}
};
return admin
.messaging()
.sendToDevice(token_id, payload)
.then(result => {
console.log("Notification Sent.");
});
});
});
});
最佳答案
你没有提到错误在哪里。我认为错误将在行
console.log("通知已发送。");
如果你这样做
return console.log("通知已发送。");
错误应该消失,而警告仍然存在。
正如 Marcos 上面提到的,最好将 Promise 链接起来而不是嵌套。
关于javascript - 每个 then() 应该返回一个值或抛出 Promise/Always-return,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49604619/