title: How to use wildcards in a firebase observer path ?
body: <p>Is it possible to use wildcards in the path of a firebase observer ? </p>
  
  <p>Right now I have : </p>
  
  <pre><code>self.ref?.child('root').child('info').observe(
      DataEventType.childChanged, with: { (snapshot) -&gt; Void in
  
      //do something   
  
  })
  </code></pre>
  
  <p>Is there any way to achieve something like :  </p>
  
  <pre><code>self.ref?.child('root').child('info').child(&lt;wildcard&gt;).child('details').observe(
       DataEventType.childChanged, with: { (snapshot) -&gt; Void in
  
      //find out what the wildcard is &amp; do something
  
  })
  </code></pre>
  
  <p>Thanks</p>