Ionic 2 model driven form using array of radios

<!DOCTYPE html>
<html>
  <head>
    <script src="https://code.angularjs.org/tools/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/reflect-metadata/0.1.3/Reflect.js"></script>
    <script src="https://cdn.rawgit.com/angular/zone.js/master/dist/zone.min.js"></script>
    <script src="config.js"></script>
    <script src="https://npmcdn.com/ionic-angular@2.0.0-beta.11/bundles/ionic.system.js"></script>
  
    <link href="https://npmcdn.com/ionic-angular@2.0.0-beta.11/bundles/ionic.css" rel="stylesheet">
    <link href="style.css" rel="stylesheet">
  </head>

  <body>
    <!-- this Ionic's root component and where the app will load -->
    <ion-app></ion-app>
    
    <script>
      System.import('app.ts')
    </script>
  </body>

</html>

import { NavController } from 'ionic-angular/index';
import { Page1 } from 'page1.ts'
import { Component } from "@angular/core";
import { FormBuilder, Validators, FormArray } from "@angular/forms";


@Component({
  templateUrl:"home.html"
})
export class HomePage {
  
  greeting: string;
  public surveyForm;
  public questions;
  
  constructor(private nav: NavController, public fb: FormBuilder) {
    
    this.questions = [
      {
        question: 'How old are you?',
        answers: [
          {id: 1, answer: 'Under 18'},
          {id: 2, answer: 'Over 18'},
        ]
      },
      {
        question: 'Do you like Ionic Framework?',
        answers: [
          {id: 1, answer: 'Yes'},
          {id: 2, answer: 'No'},
        ]
      }
    ];
    
		this.surveyForm = this.fb.group({
		  name: ['', Validators.required]
		  survey: this.fb.group({
		    id: ['', Validators.required],
		    questions: new FormArray([])
		  })
		});
		
		let question1 = this.fb.group({
		  question_id: [0, Validators.required],
		  answer_id: ['', Validators.required]
		});
		this.surveyForm.controls.survey.controls['questions'].push(question1);
		
		let question2 = this.fb.group({
		  question_id: [1, Validators.required],
		  answer_id: ['', Validators.required]
		});
		this.surveyForm.controls.survey.controls['questions'].push(question2);
		
		//let formChanges = this.surveyform.valueChanges;
		//formChanges.subscribe(x => {
		//  console.log(x);
		//});
	}
	
	goToPage1() {
	  this.nav.push(Page1);
	}


}

SCROLL-CONTENT {
	overflow-y: auto !important;
}

CODE {
  background: #EFEFEF;
}

/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 * Override at the last minute with global.filterSystemConfig (as plunkers do)
 */
(function(global) {

  var ngVer = '@2.0.0-rc.4'; // lock in the angular package version; do not let it float to current!

  //map tells the System loader where to look for things
  var  map = {
    'app':                        'src', // 'dist',
    'rxjs':                       'https://npmcdn.com/rxjs@5.0.0-beta.6',
    'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api',
    '@angular/forms': 'https://npmcdn.com/@angular/forms@0.2.0'
  };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'app.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' },
    'angular2-in-memory-web-api': { defaultExtension: 'js' },
    '@angular/forms': { main: 'index.js', defaultExtension: 'js' }
  };

  var packageNames = [
      '@angular/common',
      '@angular/compiler',
      '@angular/core',
      '@angular/http',
      '@angular/router',
      '@angular/platform-browser',
      '@angular/platform-browser-dynamic',
      '@angular/router-deprecated',
      '@angular/testing',
      '@angular/upgrade',
  ];

  // add map entries for angular packages in the form '@angular/common': 'https://npmcdn.com/@angular/common@0.0.0-3'
  packageNames.forEach(function(pkgName) {
    map[pkgName] = 'https://npmcdn.com/' + pkgName + ngVer;
  });

  // add package entries for angular packages in the form '@angular/common': { main: 'index.js', defaultExtension: 'js' }
  packageNames.forEach(function(pkgName) {
    packages[pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  var config = {
    transpiler: 'typescript',
    typescriptOptions: {
      emitDecoratorMetadata: true
    },
    map: map,
    packages: packages
  }

  // filterSystemConfig - index.html's chance to modify config before we register it.
  if (global.filterSystemConfig) { global.filterSystemConfig(config); }

  System.config(config);

})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import { Component } from "@angular/core";
import { ionicBootstrap, Platform } from 'ionic-angular/index';
import { HomePage } from './home.ts';


@Component({
  template: '<ion-nav [root]="rootPage"></ion-nav>'
})
export class MyApp {
  constructor(private platform: Platform) {
    this.rootPage = HomePage;
  }
}

ionicBootstrap(MyApp);

<ion-header>
  <ion-navbar primary>
    <ion-title>
      Ionic 2
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content class="has-header">
  
    <h1>Ionic 2 Test</h1>
    <p>
      Use this template to create a demo environment
      where the issues you're facing are reproduced. This will
      help us in easily reproducing your issue and solving it faster (:
    </p>
    <form [formGroup]="surveyForm">
      <ion-list>
        <ion-item>
          <ion-label floating>Name</ion-label>
          <ion-input type="text" value="" formControlName="name"></ion-input>
        </ion-item>
      </ion-list>
      <div formGroupName="survey">
        <div formArrayName="questions">
          <div *ngFor="let question of questions; let i = index" [formGroupName]="i">
            <ion-list radio-group formControlName="answer_id">
              <ion-list-header>{{ question.question }}</ion-list-header>
              <ion-item *ngFor="let answer of question.answers">
                <ion-label>{{ answer.answer }}</ion-label>
                <ion-radio [value]="answer.id"></ion-radio>
              </ion-item>
            </ion-list>
          </div>
        </div>
      </div>
      <button ion-button color="primary">Save</button>
      <pre>{{ surveyForm.value | json }}</pre>
    </form>
</ion-content>

You can use this template to show examples of your Ionic 2 issue.

import { Component } from '@angular/core';
import { ModalController} from 'ionic-angular/index'

@Component({
  templateUrl:"page1.html"
})
export class Page1 {
  
  
  constructor( private modalCtrl: ModalController) {
		
	}
	

}

<ion-header>
  <ion-navbar primary>
    <ion-title>
      Ionic 2
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content class="has-header">
  <div padding style="text-align: center;">
    <h1>Ionic 2 Test</h1>
  </div>
</ion-content>

import { Component } from "@angular/core";
import {HomePage} from './home.ts';


@Component({
  templateUrl: 'tabs.html'
})
export class TabsPage {
  // this tells the tabs component which Pages
  // should be each tab's root Page
  tab1Root: any = HomePage;

}

<ion-tabs>
  <ion-tab [root]="tab1Root" tabTitle="Tab 1" tabIcon="pulse"></ion-tab>
</ion-tabs>