I want to do a user search vie search bar.when I enter the last name I should receive data about users if there are matches but i don't know how.

here is my try 

```
searchBar(){
  let a=app.database().ref('users/'+app.auth().currentUser.uid).orderByChild('/surname').equalTo('Крюкин');
  console.log(a);
}

```

here is structure of data

![enter image description here](https://i.stack.imgur.com/x37ck.png)