使用 Cloud Function 创建文档时发送通知

Question

我使用 Firebase 和 Firestore 作为数据库

我想在用户通知集合中创建文档时推送新通知。

应该是这样的，

  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.helloWorld = functions.https.onRequest((request, response) => {
//  response.send("Hello from Firebase!");
// });

exports.sendNotificationToTopic = functions.firestore.document('notification/{notificationId}').onWrite(async  (event) => {

  var message ={
      notification: {
          title: "This is Title",
          body: "This is the Body",
          user: "fA0eLup_TUKVzdBkQbd3Qb:APA91bHuSuZOjdJgXn6xBndhQQkfnzm1pdLl9x3B2FZUYcYQULVPJFRbERezPuLoXD4QCUU2yalLUvgRfEas4B0sKAcwOkcmGkudLFvQWqTT7uhG21pKffTNTz5GvWKcD2-hKkfPq9Gq"

      },

      "token": user


  };

  let response=await admin.messaging().send(message);
  console.log(response);

});

是的，我正在使用云功能

当我在通知集合中创建文档时，我没有收到通知

我在云功能日志中遇到了一些错误

sendNotificationToTopic 
Error: Exactly one of topic, token or condition is required at FirebaseMessagingError.FirebaseError [as constructor] (/srv/node_modules/firebase-admin/lib/utils/error.js:42:28) at FirebaseMessagingError.PrefixedFirebaseError [as constructor] (/srv/node_modules/firebase-admin/lib/utils/error.js:88:28) at new FirebaseMessagingError (/srv/node_modules/firebase-admin/lib/utils/error.js:254:16) at Object.validateMessage (/srv/node_modules/firebase-admin/lib/messaging/messaging-types.js:46:15) at Messaging.send (/srv/node_modules/firebase-admin/lib/messaging/messaging.js:207:27) at exports.sendNotificationToTopic.functions.firestore.document.onWrite (/srv/index.js:22:40) at cloudFunction (/srv/node_modules/firebase-functions/lib/cloud-functions.js:131:23) at /worker/worker.js:825:24 at <anonymous> at process._tickDomainCallback (internal/process/next_tick.js:229:7) 

Answer 1

将令牌添加到您的 var 消息变量。

{ "notification": { title: "This is Title", body: "This is the Body", }, "token": user_info.device_id } 您可以从 Tools --> Firebase --> Cloud Messaging --> Step 4 Firebase cloud messing step 4 implementation 中获取令牌，简要说明一下。