关于 Firestore 文档的更新值

Question

I am trying to make a chat app as a learning project.我正在尝试将聊天应用程序作为学习项目。 when i am trying to run当我试图跑步时

firebase.functions.firestore
    .document('messages/lastMessage')
    .onUpdate((snapshot, context) => {

        const after = snapshot.after.data();
        console.log(after)

})

i am getting this error: Uncaught TypeError: Cannot read property 'document' of undefined我收到此错误： Uncaught TypeError: Cannot read property 'document' of undefined错误： Uncaught TypeError: Cannot read property 'document' of undefined

this is how i am importing firebase into my html:这就是我将 firebase 导入到我的 html 中的方式：

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Instter</title>

    <script:scr="https://www.gstatic.com/firebasejs/8.0.2/firebase.js"></script>
    <script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-app.js"></script>
    <script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-functions.js"></script>
    <script src="https://www.gstatic.com/firebasejs/8.7.0/firebase-firestore.js"></script>  
</head> 
<body>
     <script src="index.js"></script>
</body>

I have tried searching everywhere but didn't found anything.我试过到处搜索，但没有找到任何东西。 please let me know if you know something about this.如果您对此有所了解，请告诉我。 Thank you谢谢

Answer 1

It seems like you are trying to run the functions in your web app.您似乎正在尝试在您的网络应用程序中运行这些功能。 You must initialize Cloud Functions using the CLI in your project directory.您必须使用项目目录中的 CLI 初始化 Cloud Functions。 Create a new directory (or use existing Firebase project directory) and run the following command:创建一个新目录（或使用现有的 Firebase 项目目录）并运行以下命令：

firebase init functions

Go through the setup and you'll get a directory structure similar to this (will be slightly different for Javascript and Typescript):完成设置，您将获得与此类似的目录结构（Javascript 和 Typescript 略有不同）：

Then in your index.ts (or .js ) file:然后在您的index.ts （或.js ）文件中：

import * as functions from "firebase-functions";

export const firestoreTrigger = functions.firestore.document("/messages/{lastMessage}").onUpdate((change, context) => {
    const lastMessage = change.after.data().lastMessage;
    console.log(lastMessage);
    return;
});

You can write your functions in them.您可以在其中编写函数。 To deploy, run the firebase deploy --only functions command.要进行部署，请运行firebase deploy --only functions命令。

关于 Firestore 文档的更新值

问题描述

1 个解决方案

解决方案1
1 2021-07-08 12:32:57

关于 Firestore 文档的更新值

问题描述

1 个解决方案

解决方案1 1 2021-07-08 12:32:57

解决方案1
1 2021-07-08 12:32:57