title: Can't modifiy eloquent query result
body: <p>So I got the following code in my controller's <code>show</code> function which just returns a page with the tags:</p>
  
  <pre><code>$page = Post::with('tags')-&gt;findOrFail($id);
  $page-&gt;tags-&gt;lists('name');
  return response($page);
  </code></pre>
  
  <p>When I try to to execute this, it won't change the <code>tags</code> key, which is an array with the tags from the eloquent <code>belongsToMany</code> relationship.</p>
  
  <p>Why isn't this working? To me it seems pretty handy to just change a value like this.</p>
  
  <p>When I change it to <code>$page-&gt;test = $page-&gt;tags-&gt;lists('name')</code> it will add the <code>test</code> key as usual.</p>
  
  <p>How would I modify a eloquent value in a easy way?</p>