Firebase功能错误，因此设备到设备通知被卡住

Question

我刚刚接触到Firebase函数，最初一切正常，但现在我面临以下错误。我在下面提供错误和我的代码。

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

// // Create and Deploy Your First Cloud Functions
// // https://firebase.google.com/docs/functions/write-firebase-functions
//
exports.sendNotification = functions.database.ref('/Notification/{user_id}/{notification_id}').onWrite(event =>{

  const user_id = event.params.user_id;
  const Notification = event.params.Notification;

  console.log('We have a Notification to send to :', user_id);

  if (!event.data.val()) {

    return console.console.log('A Notify has been deleted from the database :', notification_id);

  }

  const devicetoken = admin.database().ref(`/Users/{user_id}/device_token`).once('value');

  return devicetoken.then(result =>{

    const token_id = result.val();


    const payload = {
      notification: {
        title : "Follower Request",
        body: "You've received a new friend request",
        icon: "default"
      }
    };

    return admin.messaging().sendToDevice(token_id, payload).then(response =>{

      console.log('This was the notification Feature')

    });


  });


});

下面是我在Firebase函数中收到的错误。

错误：提供给sendToDevice（）的注册令牌必须是非空字符串或非空数组。在FirebaseMessagingeror。FirebaseMessagingError出现错误（本机）。FirebaseError[作为构造函数]（/user_code/node_modules/firebase admin/lib/utils/error.js:39:28）位于FirebaseMessagingeror。在新的FirebaseMessagingError（/user_code/node_modules/firebase admin/lib/utils/error.js:85:28）的消息传递中，使用prefixedFrebeSeError[作为构造函数]（/user_code/node_modules/firebase admin/lib/utils/error.js:207:16）。在消息传递中验证注册KenStype（/user_code/node_modules/firebase admin/lib/messaging/messaging.js:589:19）。在devicetoken上发送设备（/user_code/node_modules/firebase admin/lib/messaging/messaging.js:210:14）。然后进程中的结果（/user_code/index.js:36:30）_tickDomainCallback（内部/process/next_tick.js:135:7）

上述错误的firebase函数图像

图片提供了我如何存储设备\u令牌\u id的想法

任何帮助都将不胜感激。

Answer 1

您没有在某些地方使用模板标签${}

还要确保您要发送通知的用户在Firebase中存储了有效的device_token。

实施这些更改和更新方法后的最终代码是：

'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((change, context) => {

  const user_id = context.params.user_id;
  const notification_id = context.params.notification_id;

  console.log('We have a notification to send to : ', context.params.user_id);

  if(!change.after.val()) {
      return console.log('A Notification has been deleted from the database : ' + context.params.notification_id);
  }

  const deviceToken = admin.database().ref(`/Users/${user_id}/device_token`).once('value');

  return deviceToken.then(result =>  {

    const token_id = result.val();

    const payload = {
        notification: {
            title : "Follower Request",
            body: "You've received a new friend request",
            icon: "default"
        }
    };

    return admin.messaging().sendToDevice(token_id, payload).then(response => {
        return console.log('This was the notification Feature');  
    });

  });

});

对于所有提到TVAC Studio的Lapit聊天应用程序教程的人，我提到了上述更改的答案https://stackoverflow.com/a/49746976/7549743