title: Add active class to element in nested ngFor Angular 6
body: <p>I would like to add active class after click, and I have problem with ngFor inside ngFor. When I clik on one radio, active class is added to all rows, because is the same name. Besides, now I can click only for one radio, I want to click for one radio in the row (I do not know how to make a radio independent of each other between the rows)</p>
  
  <p>I want to add active class independent between rows, so eg I want to selected test1 from Lorem, test2 from Ipsum and test1 from dolor. Now I can choose only one radio from all elements. </p>
  
  <p>My example <a href="https://stackblitz.com/edit/angular-aupnma?file=src%2Fapp%2Fapp.component.ts" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-aupnma?file=src%2Fapp%2Fapp.component.ts</a></p>