如何通过 Firebase Cloud 功能将数据写入/更新到多个子节点? [英] How do I write/update data to multiple child nodes via Firebase Cloud functions?

问题描述

我有一个如下所示的数据库:

I've got a database that looks like this:

我想在特定时间(比如上午 12 点)为数据库中的所有用户自动将 Patient_List 和 Current_Token 子项重置为 0.

I want to reset the Patient_List and Current_Token children to 0 at a particular time (say 12 AM) automatically for all the users in the database.

我浏览了 Firebase 云函数文档和 gitHub 上的这些项目:删除节点和删除未使用的使用 Cron 的用户帐户.上述两个示例都基于特定的 UID 更新和更改数据，即仅基于传递的 UID 更新特定节点.我想知道是否可以更新所有节点中上述子元素的值，如果可以，如何完成?

I went through the Firebase cloud function docs and these projects on gitHub: Deleting nodes and Delete unused user accounts using Cron. Both of the above examples update and change data based on a particular UID i.e update only particular nodes based on the UID passed. I would like to know if it is possible to update values for the above child elements in all the nodes and if so , how would it be done?

推荐答案

只使用通用 ref，在此之前引用你要更新的所有节点，就像这样:

Only use the general ref, and before that reference all nodes that you want to update, just like this:

var gralRef = firebase.database().ref();
var obj_update={};                              
obj_update[`users/${firstuser}/name`]='John';
obj_update[`users/${seconduser}/name`]='Mark';
obj_update[`users/${seconduser}/address`]='New York';   


gralRef.update(obj_update);                     

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