我想创建一种发送朋友请求时向用户发送通知的方式,但是我遇到了一个问题,即我是用户标识,表明它不存在,我以前的项目中的代码正在工作,但现在它不工作?谁能帮我?
这是错误:
TypeError: Cannot read property 'user_id' of undefined
at exports.sendNotification.functions.database.ref.onWrite.event (/user_code/index.js:9:31)
at Object.<anonymous> (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27)
at next (native)
at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:28:71
at __awaiter (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:24:12)
at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:82:36)
at /var/tmp/worker/worker.js:716:24
at process._tickDomainCallback (internal/process/next_tick.js:135:7)
错误图片:
这是我的节点JS索引代码:
'use strict'
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.sendNotification = functions.database.ref('/notifications/{user_id}/{notification_id}').onWrite(event => {
const user_id = event.params.user_id;
const notification_id = event.params.notification_id;
console.log('We have a notification from : ', user_id);
if(!event.data.val()){
return console.log('A Notification has been deleted from the database : ', notification_id);
}
const fromUser = admin.database().ref(`/notifications/${user_id}/${notification_id}`).once('value');
return fromUser.then(fromUserResult => {
const from_user_id = fromUserResult.val().from;
console.log('You have new notification from : ', from_user_id);
const userQuery = admin.database().ref(`/Users/${from_user_id}/name`).once('value');
const deviceToken = admin.database().ref(`/Users/${user_id}/device_token`).once('value');
return Promise.all([userQuery, deviceToken]).then(result => {
const userName = result[0].val();
const token_id = result[1].val();
console.log('User is : ', userName);
console.log('Token id is : ', token_id);
const payload = {
notification: {
title : "New Friend Request",
body: `${userName} has sent you request`,
icon: "default",
click_action : "com.abd.app_TARGET_NOTIFICATION"
},
data : {
from_user_id : from_user_id
}
};
return admin.messaging().sendToDevice(token_id, payload).then(response => {
return console.log('This was the notification Feature');
});
});
});
});
Firebase db root的图片:
发布于 2018-06-19 19:59:59
数据库onWrite事件的API随1.0版本的SDK而改变。
onWrite事件现在发送一个Change对象而不是事件。你应该更新你的代码以使用Change对象。另外,onWrite回调的第二个参数是一个EventContext,它具有来自路径的通配符参数。
https://stackoverflow.com/questions/-100005437
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