Firebase云功能已停止工作 - event.data undefined [英] Firebase cloud functions stopped working - event.data undefined

问题描述

我有一些云功能，但他们突然停止工作，现在我得到event.data undefined

I have some cloud functionsbut they suddenly stopped working, now I'm getting event.data undefined

exports.newMessageReceived = functions.database.ref('/messages/{pushId}')
 .onWrite((event) => {

    if (event.data.previous.exists() || !event.data.exists() ) {
        //Do nothing if data is edited or deleted
        console.log('Message edited or deleted - skip');
        return;
    }
   ...
}

我得

TypeError: Cannot read property 'previous' of undefined

这是如何定义这里。firebase云功能有什么变化吗？

This is how it is defined here. There was any change in firebase cloud functions?

推荐答案

云功能已更新到1.0版，你可以点击此处查看更多信息：

Cloud functions were updated to version 1.0, you can check here for more info:

https://firebase.google.com / docs / functions / beta-v1-diff＃realtime-database

关于这个问题，您需要将代码更改为：

Regarding the question, you need to change the code into this:

exports.newMessageReceived = functions.database.ref('/messages/{pushId}').onWrite((change,context) => {

if (change.before.exists() || !change.after.exists() ) {
    //Do nothing if data is edited or deleted
    console.log('Message edited or deleted - skip');
    return;
  }

}

onWrite 现在有两个参数更改和上下文。 更改在之前有，在属性之后有，之前相当于之前

onWrite now has two parameters change and context. Change has before and after properties, and before is equivalent to previous

此外在之前更改和可以使用此处列出的方法：

Also change and before can use the methods listed here:

https://firebase.google.com/docs/reference/admin/node/admin .database.DataSnapshot

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