/**
  * @param $id - userId
  * @return array with items in cart for current user
  */
 public function findById($id)
 {
     $data = $this->db->getUserCart($id);
     $cartItems = [];
     foreach ($data as $c) {
         $cart = new Cart($c);
         array_push($cartItems, $cart);
     }
     return $cartItems;
 }