title: Laravel $touch for updating updated_at
body: <p>I have a doubt regarding <code>$touch</code> in Laravel. What I understood is, <code>$touch</code> can be used to update model or relationship without updating any other column. But what I am trying is, I need to update user table, whatever changes occurred in other users related table. 
  It can be create, update or delete. In my case, <code>$touch</code> not working with the relationship for delete. </p>
  
  <pre><code>//touch
  protected $touches = ['somerelation'];
  
  //relationship
  public function somerelation(){
      return $this-&gt;belongsTo('someModel', 'key_id');
  }
  
  public setSomeRelationAttribute(){
    $this-&gt;someRelation()-&gt;delete();
  }
  </code></pre>
  
  <p>This is what i tried. updated_at in users working fine with create and update. But not for delete.</p>
  
  <p>Is it because touch is only applicable for add and update?</p>
  
  <p>I make sure, touch not working for delete in all relations, by checking DB values.</p>
  
  <p>I need to ensure that my findings are true, that touch not works for delete</p>