title: How to put ng for and ng if in <options> angular 6?
body: <p>I need to use ngIf and ngFor on the </p>
  
  <pre><code>&lt;option *ngFor="let price of product['pricingDetails']" *ngIf="price['chainPrice']" &gt;
  </code></pre>
  
  <p>but it shows me <code>Can't have multiple template bindings on one element. Use only one attribute prefixed with *</code> error. What is the best way to use both in the  element?</p>