Failed to initialize ngx charts using data API

I am having bad times when trying to initialize a plotted graph using ngx-charts with data received by the API.

I built a rest api that spits out some time series data when called correctly.

{
    "prices": [
        {
            "item": "1",
            "price": 2,
            "estimated": 2.1,
            "date": [
                2012,
                8,
                16
            ]
        },
        {
            "item": "1",
            "price": 3,
            "estimated": 4.1,
            "date": [
                2012,
                9,
                16
            ]
        },
        {
            "item": "1",
            "price": 5,
            "estimated": 7.1,
            "date": [
                2012,
                10,
                16
            ]
        }
    ]
}

      

        
        
        
      

    

And I built price.model.ts to handle it correctly and it works just fine

export class PriceModel {
    public id: string;
    public price: number;
    public estimated: number;
    public date: number[];

    constructor(
         id: string,
         price: number,
         estimated: number,
         date: number[]
    ) {
        this.id = id;
        this.price = price;
        this.estimated = estimated;
        this.date = date;
     }
}

      

        
        
        
      

    

Then I configured my details.component.ts to make such an api call, get the data, parse it, and display it in a chart.

import { Component } from '@angular/core';
import { NgxChartsModule } from '@swimlane/ngx-charts';
import { Http } from '@angular/http';

/** App Models **/
import { PriceModel } from '../../shared/components/prices/price.model';
import { ChartDataModel } from '../../shared/components/prices/chart-data.model';

@Component({
  selector: 'app-details',
  templateUrl: './details.page.html',
  providers: [NgxChartsModule]
})

export class DetailsPage {

  private sub: any;
  private prices: PriceModel[];
  ngxData: ChartDataModel = {
    data: [
      {
        name: 'prices',
        series: []
      },
      {
        name: 'forecast',
        series: []
      }
    ]
  };

  view: any[] = [1000, 750];

  // options
  showXAxis = true;
  showYAxis = true;
  gradient = false;
  showLegend = true;
  showXAxisLabel = true;
  xAxisLabel = 'Dates';
  showYAxisLabel = true;
  yAxisLabel = 'Prices';

  colorScheme = {
    domain: ['#5AA454', '#A10A28', '#C7B42C', '#AAAAAA']
  };

  // line, area
  autoScale = true;

  constructor(private _http: Http) {
    console.log(this.ngxData.data);
    Object.assign(this.ngxData);
  }

  ngOnInit() {
    this.sub = this._http.get('someroute').subscribe((prices) => {
        this.prices = prices.json().prices;
        let currData;
        this.prices.map((p) => {
          currData = new Date(p.date[0], p.date[1], p.date[2]);
          this.ngxData.data[0].series.push({ name: currData.getTime().toString(), value: p.price });
          this.ngxData.data[1].series.push({ name: currData.getTime().toString(), value: p.estimated });
        });
      }, (err) => {
        console.log(err);
    });
  }

  ngOnDestroy() {
    this.sub.unsubscribe();
  }

}

      

        
        
        
      

    

Where my ChartDataModel.ts is defined as

export class ChartDataModel {
    public data: SerieModel[];
    constructor(data:  SerieModel[]) {
        this.data = data;
    }
}

export class SerieModel {
    public name: string;
    public series: SeriersChildModel[];
    constructor(name:  string, series: SeriersChildModel[]) {
        this.name = name;
        this.series = series;
    }
}

export class SeriersChildModel {
    public name: string;
    public value: number;
    constructor(name:  string, value: number) {
        this.name = name;
        this.value = value;
    }
}

      

        
        
        
      

    

And finally here's my details.page.html

<ngx-charts-line-chart
  [view]="view"
  [scheme]="colorScheme"
  [results]="ngxData.data"
  [gradient]="gradient"
  [xAxis]="showXAxis"
  [yAxis]="showYAxis"
  [legend]="showLegend"
  [showXAxisLabel]="showXAxisLabel"
  [showYAxisLabel]="showYAxisLabel"
  [xAxisLabel]="xAxisLabel"
  [yAxisLabel]="yAxisLabel"
  [autoScale]="autoScale">
</ngx-charts-line-chart>

      

        
        
        
      

    

Writing this.ngxData.data

before Object.assign

prints everything just fine

But I am getting the following result

I followed the example here but ended up not showing actual data.

I don't understand why, even though the data is formatted as desired by the library, the data is not displayed.

What am I doing wrong? Is this caused by incorrect initialization in the constructor?