title: How to fix ngModel cannot be used to register form controls with a parent formGroup directive
body: <p>I have this line in my angular project:</p>
  
  <pre><code> &lt;option *ngFor="let item of painLevels" value="{{item.id}}"&gt;{{item.painlevel}}&lt;/option&gt;
  </code></pre>
  
  <p>and I am getting this error:</p>
  
  <blockquote>
    <p>ngModel cannot be used to register form controls with a parent
    formGroup directive.  Try using
          formGroup's partner directive "formControlName" instead.</p>
  </blockquote>
  
  <p>How would I apply [ngModelOptions]="{standalone: true}" to a dropdown menu? All I see is examples for inputs. Or is there a better way to fix this?</p>