public async Task <int> DeleteAsync(int id)
{
Order order = await _orderRepo.GetByIdToEditAsync(id);
if (order == null)
{
throw new ApiException(MessagesResource.ORDER_NOT_FOUND, 404);
}
int bookId = order.BookId;
if (order.IsBorrowed || order.ReturnDate != null)
{
throw new ApiException(MessagesResource.ORDER_NOT_DELETABLE);
}
await _orderRepo.DeleteAsync(order);
return(bookId);
}