将侦听器添加到Firebase生成的密钥中的一个孩子？ [英] Add a listener to a child inside of a firebase generated key?

问题描述

给定布局

  + activity 
 + -K5p_pBXog4kb0SVLXxj 
 text：'something'，
当：111 
 +线程
 + -K5paF53zm3cuudP9FUQ 
 id：8，
 text：'别的东西'
  

有没有办法将一个监听器添加到像/ activity / * / thread这样的活动中的任何新的线程中？

添加新活动时，我得到这些饲料，但是当一个线程被追加没有什么触发器。我需要将[thread]部分移出到它自己的根目录，并将线程ID与活动ID进行匹配，以便知道何时对主活动线程进行线程评论？

解决方案

根据您的评论更新答案。

您要收听 / activity / $ theid / thread / $ threadId ：

不是嵌套，而是分解 / thread / $ threadId
$ {
threadActivity：{
$ activity $ b $ $ $ threadId $ {

$ b}


code $

现在，当添加一个新线程时，您可以只听$ / threadActivity / $ activityId ：

  var ref = new Firebase（'https：//< my> .firebaseio.com / threadActivity'）; 
 var activityRef = ref.child（'some-id'）; 
 activityRef.on（'child_added'，function（snap）{
 //将会更新你所在位置的每个孩子，并且每个孩子都被添加
 console.log（snap.val（）） ; 
}）; 
  

Given the layout

+ activity
  + -K5p_pBXog4kb0SVLXxj
    text:'something',
    when:111
    + thread
      + -K5paF53zm3cuudP9FUQ 
        id:8,
        text:'something else'

Is there a way to add a listener to any new "thread" inserts inside of activity like /activity/*/thread?

When new activities get added I am getting the feed on those but when a thread is appended nothing triggers. Do I need to move the [thread] section out to it's own root and match thread ID's with activity ID's to know when a thread comment is made against the main activity thread?

解决方案

Updating the answer based upon your comment.

You want to listen to /activity/$theid/thread/$threadId:

Rather than nesting, break out the /thread/$threadId into it's own location at the root.

{
  "threadActivity": {
     "$activityId": {
        "$threadId" : {

        } 
     }
   } 
}

Now when a new thread is added you can just listen to /threadActivity/$activityId:

var ref = new Firebase('https://<my>.firebaseio.com/threadActivity');
var activityRef = ref.child('some-id');
activityRef.on('child_added', function(snap) {
  // will update you for every child at the location and each child added
  console.log(snap.val()); 
});

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