功能通知在聊天应用程序Firebase中不起作用 [英] Functions notifications not working in chat app firebase
问题描述
我制作了一个android聊天应用程序,并使用firebase中的功能设置了自动通知,一切正常,但是当我发送消息通知时不会出现
I made a android chat app and setup the automated notifications using functions in firebase, everything is working fine but when i send a message notifications won't come
以下是Firebase功能中的日志-
Here are the logs in firebase function -
这是index.js文件-
Here is the index.js file -
'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;
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;
const type = fromUserResult.val().type;
const userQuery = admin.database().ref(`Users/${from_user_id}/name`).once('value');
const deviceToken = admin.database().ref(`/Users/${user_id}/token`).once('value');
return Promise.all([userQuery, deviceToken]).then(result =>
{
const userName = result[0].val();
const token_id = result[1].val();
if(type == "request")
{
const payload =
{
data:
{
title : "You have a Friend Request",
body: `${userName} wants to be your friend!`,
icon: "default",
click_action : "com.namandevloper.satyampublic_PROFILE_TARGET_NOTIFICATION",
from_user_id : from_user_id
}
};
return admin.messaging().sendToDevice(token_id, payload).then(response =>
{
console.log(`${userName} (${from_user_id}) sent friend request to ${user_id}`);
});
}
else if(type == "message")
{
const payload =
{
data:
{
title : "You have a new Message",
body: `${userName} messaged you!`,
icon: "default",
click_action : "com.namandevloper.satyampublic_CHAT_TARGET_NOTIFICATION",
from_user_id : from_user_id
}
};
return admin.messaging().sendToDevice(token_id, payload).then(response =>
{
console.log(`${userName} (${from_user_id}) send a message to ${user_id}`);
});
}
else if(type == "accept")
{
const payload =
{
data:
{
title : "You have a new friend",
body: `${userName} accepted your request!`,
icon: "default",
click_action : "com.namandevloper.satyampublic_PROFILE_TARGET_NOTIFICATION",
from_user_id : from_user_id
}
};
return admin.messaging().sendToDevice(token_id, payload).then(response =>
{
console.log(`${userName} (${user_id}) accepted request by ${from_user_id}`);
});
}
});
});
});
登录firebase函数时说-无法读取未定义的属性'user_id'
Logs in the firebase Functions says - Cannot read property 'user_id' of undefined
可能是什么问题?
推荐答案
更改此内容:
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;
if(!event.data.val())
{
return console.log('A Notification has been deleted from the database : ', notification_id);
}
对此:
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;
if(!change.after.val())
{
return console.log('A Notification has been deleted from the database : ', notification_id);
}
context参数提供有关函数执行的信息.与异步函数类型相同,上下文包含字段eventId,timestamp,eventType,resource和params.
The context parameter provides information about the function's execution. Identical across asynchronous functions types, context contains the fields eventId, timestamp, eventType, resource, and params.
查看指南:
https://firebase.google.com/docs/functions/beta-v1-diff
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