title: update database value on laravel
body: <p>does laravel have short cut for $i++; i want to update my database value went seomething happend. on php i could just use sql like </p>
  
  <pre><code>UPDATE goods SET qty++ WHERE id = '4' 
  </code></pre>
  
  <p>here is my <code>controller</code> code</p>
  
  <pre><code>public function store(Request $request)
  {
        $g = new goods();
        $g-&gt;qty = ++;
        $g-&gt;save();
  }
  </code></pre>