Firebase函数-获取当前DataSnapshot的同级 [英] Firebase functions - get sibling of current DataSnapshot

问题描述

我的数据库结构如下

My database is structured as follows

我正在使用Firebase云功能中的onWrite(snapshot, context)来监听活动节点.我想根据活动量的变化获取令牌节点的值.

I am listening to actives node by using onWrite(snapshot, context) in firebase cloud functions. I want to get the value of token node based on change in actives.

我的触发功能如下.

exports.sendNotification = functions.database.ref('root/users/{userid}/actives/{pushId}')
.onWrite((event, context) => {

var token; 

var active_userid = context.params.pushId;
   if(event.after._data != null){ 
        console.log(event.after.ref.parent.parent);

   }else{

       console.log('data is null')

   } 
return 0;

});

如何获取令牌节点并读取其值?

How do I get token node and read its value?

推荐答案

我通过

 var ref = event.after.ref.parent.parent.child('token');

          ref.on('value', function(snapshot) {
                        console.log(`token value : ${snapshot.val()}`);
                        });

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