Błąd Angular4 podczas próby porównania „[obiekt obiektu]”

Próbuję wyświetlić informacje w domenie, ale pojawia się ten błąd:

Błąd: błąd podczas próby porównania „[obiekt obiektu]”

To, co próbuję zrobić, to iteracja tych danych z

https://www.surbtc.com/api/ v2/Markets/btc-clp/ticker
https://www.surbtc.com/api/v2/ ... icker
:

{"ticker":{"last_price": ["1771455.0","CLP"], "min_ask": ["1771432.0","CLP"], "max_bid": ["1660003.0","CLP"], "volume": ["178.37375119","BTC"], "price_variation_24h":"-0.107","price_variation_7d": "-0.115"}}

Chcę to wyświetlić w html w ten sposób:

<div *ngFor="let price of prices">

 {{price.min_ask}}

 

to jest service.ts:

import { Injectable } from '@angular/core';

import { Http, Headers, Response } from '@angular/http';

import 'rxjs/add/operator/toPromise';

import {Observable} from "rxjs";

import 'rxjs/Rx';

import 'rxjs/add/operator/catch';

import { SurbtcMarket } from './surbtcmarket'

@Injectable()

export class SurbtcService { constructor(private http: Http, private surBtcMarket : SurbtcMarket) { } public getPricess() :Observable<SurbtcMarket> {

 return this.http.get('https://www.surbtc.com/api/v2/markets/btc-clp/ticker')

 .map((response: Response) => response.json());

 }}

Interfejs Surbtcmarket.ts

export class SurbtcMarket {

public ticker: SurbtcMarketView[];

}export class SurbtcMarketView {

 public last_price : number;

 public min_ask : number;

 public max_bid : number;

 public volume : number;

 public price_variation_24h : number;

 public price_variation_7d : number;

}

component.ts

import { Http, Response, Headers } from '@angular/http';

import { SurbtcService } from '../../surbtc/surbtc.service';

import {Observable} from "rxjs";@Component({

 selector: 'app-comprarltc',

 templateUrl: './comprarltc.component.html',

 styleUrls: ['./comprarltc.component.scss']

})

export class ComprarltcComponent implements OnInit { private prices = []; constructor(private surbtcService: SurbtcService) {

 this.surbtcService = surbtcService;

 }ngOnInit(){

 this.surbtcService.getPricess()

 .subscribe( data => this.prices = data.ticker

 );

}

}