public async Task CompleteOrderAsync(int orderId)
{
var order = await _context.Orders.SingleAsync(o => o.Id == orderId);
if (order.CompletedAt != null)
{
throw new AlreadyCompletedOrderException(orderId);
}
order.CompletedAt = DateTime.Now.Truncate();
await _context.SaveChangesAsync();
_updateService.SendDispatchOrderCompleted(orderId).Forget();
_updateService.SendRestaurantsUpdated(new[] { order.RestaurantId }).Forget();
_updateService.SendUserOrdersUpdated(new[] { orderId }, order.Username).Forget();
}
