How to filter firebase array in ionic 3


how i can filter firebase array in ionic 3
i used this code to get content of firebase table


assets: FirebaseListObservable<any>;
   @Input() search: string = "";

  constructor(public navCtrl: NavController,public platform: Platform,private http: Http,private zone: NgZone,public angFire: AngularFire,public alert: AlertController) {
    this.assets = angFire.database.list('/sho/products');  

i want for example show only in ngfor contents with age 25


Take a look of how to query firebase lists over here:


thanks you always help that mean alot to me