public function updateGift(Request $request, $id)
{
$order = Purchase::findOrFail($id);
if ($order->items()->where('product_id', 'gift')->exists()) {
$item = OrderItems::where('product_id', 'gift')->where('order_id', $id);
$item->delete();
} else {
$newItem = new OrderItems();
$newItem->order_id = $id;
$newItem->qty = 1;
$newItem->product_id = 'gift';
$newItem->save();
}
}
