title: angular2 listing piped/filtered ngFor results
body: <p>I got ng2 page with several nested *ngFor each with pipes I want to get the list of inner items in order to do action on all of them.</p>
  <p>Something like this:</p>
  <pre><code>&lt;div *ngFor=&quot;let a of b | x |y | z&quot;&gt;
    &lt;div *ngFor=&quot;let c of a  | x |y | z&quot;&gt;
      &lt;div *ngFor=&quot;let d of c&quot;&gt;
        &lt;div [service]=&quot;(d.item|async)&quot;&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  <p>I want to list all d.item in a single list, and call a method on it.</p>