/**
  * Returns a new grid instance of all available
  * inventory stocks for selection.
  *
  * @param int|string $workOrderId
  * @param int|string $inventoryId
  *
  * @return \Cartalyst\DataGrid\DataGrid
  */
 public function gridStocks($workOrderId, $inventoryId)
 {
     $workOrder = $this->workOrder->model()->findOrFail($workOrderId);
     $columns = ['id', 'location_id', 'quantity', 'created_at'];
     $settings = ['sort' => 'created_at', 'direction' => 'desc', 'threshold' => 10, 'throttle' => 11];
     $transformer = function (InventoryStock $stock) use($workOrder, $inventoryId) {
         return ['id' => $stock->id, 'location' => $stock->location ? $stock->location->trail : '<em>None</em>', 'quantity' => $stock->quantity, 'select_url' => route('maintenance.work-orders.parts.stocks.take', [$workOrder->id, $inventoryId, $stock->id])];
     };
     return $this->inventory->gridStocks($inventoryId, $columns, $settings, $transformer);
 }