Angular Firebase Database Querying

Question

This is my .ts file

import { Component, OnInit } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable, FirebaseObjectObservable } from 'angularfire2/database';

@Component({
  selector: 'app-candidate-reg-success',
  templateUrl: './candidate-reg-success.component.html',
  styleUrls: ['./candidate-reg-success.component.css']
})
export class CandidateRegSuccessComponent implements OnInit {

  constructor() { 
    debugger;
    const rootRef=firebase.database.ref();
    const mail=rootRef.child('candidates_list').orderByChild('email').equalTo('[email protected]');
    console.log(mail);

  }

  ngOnInit() {
  }

}

I am trying to query the user from candidates_list table which has the email address [email protected].

But I am unable to console it. It shows a error like

Property 'ref' does not exist on type 'typeof database'.

Any solution to query angular firebase database?

Answer 1

you need to inject the AngularFirebaseData in constructor and change the code and try again

import { Component, OnInit } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable,   
   FirebaseObjectObservable } from 'angularfire2/database';

@Component({
  selector: 'app-candidate-reg-success',
 templateUrl: './candidate-reg-success.component.html',
 styleUrls: ['./candidate-reg-success.component.css']
})
  export class CandidateRegSuccessComponent implements OnInit {

  constructor(public db: AngularFireDatabase) { 
    debugger;
    db.list('/candidates_list', ref => ref.orderByChild('email').equalTo('[email protected]'));
}   
 ngOnInit() {
    }}