使用Firebase查询从ID数组中获取数据 [英] Use Firebase-query to get data from an array of ID's

问题描述

我正在尝试使用Polymerfire的firebase-query为数组中的每个ID检索一个子列表。我有三个ID和一个firebase查询数组，如下所示：

 < firebase-query id =teamContacts 
 path ={{teamConPath}}
 data ={{teamConData}}>< / firebase-query> 
  

和一些观察者看起来像：

  teamConData：{
 observer：'_teamConDataChanged'
}，
 teamConPath：{
 value：''，
 observer ：'_teamConPathChanged'
}，
 
 _teamConPathChanged：function（newValue，oldValue）{
 var self = this; 
 if（！app.isEmpty（newValue））{
 this。$。teamContacts.getStoredValue（newValue）.then（（response）=> {
 // self.teamConData = value ; 
 console.log（'gsv then'）; 
}）; 
 console.log（'teamConData：'，this.teamConData）; 
 $ b $，
 _teamConDataChanged：function（newValue，oldValue）{
 console.log（'teamConChanged'，newValue）; 
}，
  

初始路径 teamContacts 为空。在我设置路径后，我不明白如何获取和使用数据。 Firebase文档显示了一个称为 getStoredValue（）的方法，但是该方法似乎不在Github上的firebase查询源中。我认为设置一个新的路径将获取数据并触发数据的观察者，但似乎并不是这样。我怎样才能得到的firebase查询重新查询与新的路径，然后与数据异步工作？

解决方案

teamConData 这是一个对象，我将创建一个观察者，如

  observers：[ '_teamConDataObserver（teamConData。*）']，
 _teamConDataObserver：function（changedData）{
 //对数据做
} 
  pre> 
 
 
我会建议你看看这个polycast，它可能会有帮助。 https://youtu.be/m1hFhDYDY6o?t=4m35s  
 
I'm trying to use Polymerfire's firebase-query to retrieve a list of children for each ID in an array. I have and array with three ID's and a firebase-query that looks like:
<firebase-query id="teamContacts"
                path= "{{teamConPath}}"
                data="{{teamConData}}"></firebase-query>
and a couple observers that look like: 
teamConData: {
  observer: '_teamConDataChanged'
},
teamConPath: {
  value: '',
  observer: '_teamConPathChanged'
},

_teamConPathChanged: function(newValue, oldValue) {
  var self = this;
  if (!app.isEmpty(newValue)) {
    this.$.teamContacts.getStoredValue(newValue).then((response) => {
      // self.teamConData = value;
      console.log('in the gsv then');
    });
    console.log('teamConData: ', this.teamConData);
  }
},
_teamConDataChanged: function(newValue, oldValue) {
  console.log('teamConChanged', newValue);
},
Initially the path to teamContacts is null. After I set the path I don't understand how to get and work with the data. The Firebase documentation shows a method called getStoredValue() but that method doesn't seem to be present in the firebase-query source on Github. I thought setting a new path would fetch the data and trigger the observer for the data but that doesn't seem to be the case. How can I get the firebase-query to re-query with the new path and then asynchronously work with the data?
解决方案
As teamConData it's an object I will create an observer like
observers: ['_teamConDataObserver(teamConData.*)'],
_teamConDataObserver: function(changedData) {
    // do something with the data
}
I will recommend you to look at this polycast, it could be helpful https://youtu.be/m1hFhDYDY6o?t=4m35s

                        
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