title: Laravel 5.4 collection sortByDesc not working
body: <p>I have two queries with Eloquent which I collect and merge and after i do <code>sortByDesc</code> but it's not sorting collection.</p>
  
  <pre><code>$f_games = collect(Game::with('fUser', 'sUser')-&gt;where('first_user_id', Auth::user()-&gt;id)&gt;get());
  $s_games = collect(Game::with('fUser', 'sUser')-&gt;where('second_user_id', Auth::user()-&gt;id)-&gt;get());
  
  $response = $f_games-&gt;merge($s_games)-&gt;sortByDesc('id');
  </code></pre>