title: Default value on radio input and input at the same time
body: <p>I have an array of objects that i need to edit. The array is like:</p>
  
  <pre><code>{
    answers: [ { answer: 'answer 1', isValid: true }, { answer: 'answer 2, isValid: false } ]
  }
  </code></pre>
  
  <p>I do ngFor for create a inputs as long as <code>answers.length</code></p>
  
  <pre><code>&lt;div class="form-group" *ngFor="let answer of editItem.answers"&gt;
      &lt;div class="input-group"&gt;
           &lt;div class="input-group-prepend"&gt;
                 &lt;div class="input-group-text"&gt;
                      &lt;input type="radio" [(ngModel)]="answer.isValid" [value]="answer.isValid"&gt;
                 &lt;/div&gt;
           &lt;/div&gt;
           &lt;input type="text" class="form-control"  [(ngModel)]="answer.answer"&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I need default value on both, and only 1 radioinput checked.</p>
  
  <p>How can i do that?</p>