const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.sendNotification = functions.database.ref('/messages/diyetisyen/{uname}/{msgid}/message')
.onCreate((snapshot, context) => {
let message = snapshot.val();
let uname = context.params.uname;
let root = snapshot.ref.root;
let token = root.child('/users/' + uname + '/token').ref.token;
let payload = {
data: {
custom_notification: JSON.stringify({
body: message + '',
title: 'Seda Güler'
})
}
};
let options = { priority: "high" };
return admin
.messaging()
.sendToDevice(token, payload, options);
});
我无法在/ users / {uname} / token->值上获得令牌。
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FirebaseMessagingError.FirebaseError [作为构造函数](/srv/node_modules/firebase-admin/lib/utils/error.js:42:28) 在FirebaseMessagingError.PrefixedFirebaseError [作为构造函数](/srv/node_modules/firebase-admin/lib/utils/error.js:88:28) 在新的FirebaseMessagingError(/srv/node_modules/firebase-admin/lib/utils/error.js:253:16) 在Messaging.validateRegistrationTokensType(/srv/node_modules/firebase-admin/lib/messaging/messaging.js:911:19) 在Messaging.sendToDevice(/srv/node_modules/firebase-admin/lib/messaging/messaging.js:532:14) 在exports.sendNotification.functions.database.ref.onCreate(/srv/index.js:28:5) 在cloudFunctionNewSignature(/srv/node_modules/firebase-functions/lib/cloud-functions.js:120:23) 在/worker/worker.js:825:24 在 在process._tickDomainCallback(internal / process / next_tick.js:229:7)
答案 0 :(得分:1)
您不能通过这样做获得数据库节点的值
let token = root.child('/users/' + uname + '/token').ref.token;
您需要使用once()
的Reference
方法查询数据库,该方法是异步的。
这意味着您必须按以下步骤修改代码:
exports.sendNotification = functions.database.ref('/messages/diyetisyen/{uname}/{msgid}/message')
.onCreate((snapshot, context) => {
let message = snapshot.val();
let uname = context.params.uname;
let root = snapshot.ref.root;
let tokenRef = root.child('/users/' + uname + '/token').ref;
let payload = {
data: {
custom_notification: JSON.stringify({
body: message + '',
title: 'Seda Güler
})
}
};
let options = { priority: "high" };
return tokenRef.once('value')
.then(dataSnapshot => {
const data = dataSnapshot.val();
const token = data.token; //Here I make the assumption the token is at '/users/' + uname + '/token/token'. You may adapt it as required
return admin
.messaging()
.sendToDevice(token, payload, options);
});
});