title: AngularFire2 - Setting custom key when pushing
body: <p>I am learning angularfire2 in Ionic2</p>
  
  <pre><code> const newUser = this._db.list('/users');
    setTimeout(() =&gt; {
      newUser.push(this.userInfo)
        .then((data) =&gt; console.log(data))
    },3000)
  </code></pre>
  
  <p>I want to know if there is any way I can set my custom key when pushing new data. I tried various suggestion given on internet to update the key after insert, but no success.</p>