title: Laravel group record by months and sum price
body: <p>Hello i am trying to group record by months and sum price from orders</p>
  
  <p>I tried something like this</p>
  
  <pre><code>       $order = Order::select(DB::raw('sum(price) as sums'))-&gt;groupBy(function($date) {
      return Carbon::parse($date-&gt;created_at)-&gt;format('Y-m');
  
  });
  </code></pre>
  
  <p>but no luck, 
  I wanna get collection which I could later implement in data-tables?</p>