参考错误事件未定义node.js [重复]

Posted 2023-04-19

【中文标题】参考错误事件未定义node.js [重复]

【英文标题】：reference error event is not defined node.js [duplicate]

【发布时间】：2019-04-07 00:07:40

【问题描述】：

我正在使用通知，但通知不起作用并出现此错误，我对此并不陌生，因此我无法完全理解这一点并因错误而倾斜。任何帮助将不胜感激，我没有找到任何相关的解决方案

ReferenceError: event is not defined
at exports.sendNotification.functions.database.ref.onWrite (/user_code/index.js:9:31)
at cloudFunctionNewSignature (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:105:23)
at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:135:20)
at /var/tmp/worker/worker.js:744:24
at process._tickDomainCallback (internal/process/next_tick.js:135:7)

这是我的 index.js

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

exports.sendNotification = 

 functions.database.ref('/notifications/user_id/notification_id')
.onWrite((change, context) => 

    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.log('A Notification has been deleted from database: ', notification_id);
        

        const fromUser = admin.database().ref(`/notifications/$user_id/$notification_id`);
        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();

                    const payload = 
                      notification: 
                        title: "Message Request",
                        body: `$userName has sent you a Message Request`,
                        icon: "logo.png",
                        click_action: "com.example.gab.quadrantms_TARGET_NOTIFICATION"
                    ,
                    data : 
                        from_user_id : from_user_id
                    
                ;

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

                    console.log('This was the Notification Feature');
                    return true;
                );
            );
        );
    );

【问题讨论】：

检查这个问题 - ***.com/questions/53006628/…

您的代码使用 Cloud Functions 的 1.0 之前的语法。请在此处学习迁移指南：firebase.google.com/docs/functions/beta-v1-diff，特别是 firebase.google.com/docs/functions/… 部分

还看到了这些上一个问题：***.com/a/49647257，***.com/a/52213392，***.com/a/52058241，***.com/a/50660963 span>

对不起，先生，我完全是初学者，所以我很难理解它

【参考方案1】：

正如错误所说，event 没有在任何地方定义。看来您应该改用 context。

const user_id = context.params.user_id;
const notification = context.params.notification;

这里是EventContext 的文档：https://firebase.google.com/docs/reference/functions/functions.EventContext

还有RefBuilder.onWrite：https://firebase.google.com/docs/reference/functions/functions.database.RefBuilder#onWrite

【讨论】：

那么我应该将所有事件都更改为上下文吗？

或者您可以更改参数名称.onWrite((change, event) =>