Change FormBuilder array items in nested forms

Question

According to the API documentation the proper way to change nested values is to use method patchValue

myForm.patchValue({'key': {'subKey': 'newValue'}});

But how to change values in nested arrays like list of cars in this example below. How to get first item of list array an change model to Fiesta? Plunker

myForm.patchValue({'list': 0: {'model': 'Fiesta'}); is not working.

@Component({
  moduleId: __moduleName,
  selector: 'my-app',
  template: `<div><pre>{{ myForm.value | json }}</pre></div>`
})
export class AppComponent {

  public myForm: FormGroup;

  constructor(@Inject(FormBuilder) private _fb: FormBuilder) {

    this.myForm = this._fb.group({
      name: 'Cars',
      list:  this._fb.array([
        this.initCar(),
        this.initCar(),
        this.initCar()
      ]),
    });
    /** Change value Here **/
    this.myForm.patchValue({name: 'Automobile'});
  };

  initCar() {
    return this._fb.group({
      automaker: 'Ford',
      model:     'Fusion'
    });
  }
}

Plunker

Answer 1

I did something similar not that long ago just add.

const patchV = (<FormArray>this.myForm.controls['list']).at(0) as FormArray;
patchV.patchValue({automaker: 'CoolCar', model: 'Bucket'})

Working Example [plunker]http://embed.plnkr.co/VWicnA/