How to use ngFor with ngModel

Ionic Framework ionic-v3
11

I have a very similar situation, except my questions can be of various types, such as multiple choice / free text / record audio, so my Question looks like this:

export interface Question {
  style: "choose" | "write" | "speak";
  prompt: string;
  choices?: string[];
  multi?: boolean;
  answer?: string;
}

In the template, I merely bind to the answer property of each question (showing only the multiple choice option because it’s closest to OP’s situation):

<ion-item *ngFor="let q of questionnaire">
  <ion-select *ngIf="q.style === 'choose'"
      [multiple]="q.multi" [(ngModel)]="q.answer">
    <ion-option *ngFor="let choice of q.choices" [value]="choice">{{choice}}</ion-option>
  </ion-select>
</ion-item>