public async Task <IActionResult> BringbackItem(string transactionId, CancellationToken cancellationToken)
{
var command = new BringbackItemsCommand(transactionId);
await bringbackItemsCommandHandler.HandleAsync(command, cancellationToken).ConfigureAwait(false);
return(NoContent());
}
public async Task HandleAsync(BringbackItemsCommand command, CancellationToken cancellationToken)
{
using (var context = dbContextFactory.CreateDbContext())
{
requestValidator.ValidateAndThrow(command);
// This is for idempotence. We check only the TransactionId because we assume that if one item in a transaction is brought back then so are the others.
var itemsAlreadyBroughtBack = await context.ProductBroughtBackEvents.AnyAsync(evt => evt.TransactionId == command.TransactionId, cancellationToken).ConfigureAwait(false);
if (itemsAlreadyBroughtBack)
{
return;
}
var correspondingTakeoutEvents = await context
.ProductTakenOutEvents
.AsNoTracking()
.Where(evt => evt.TransactionId == command.TransactionId)
.ToListAsync(cancellationToken)
.ConfigureAwait(false);
if (correspondingTakeoutEvents.Count == 0)
{
return;
}
foreach (var takeoutEvent in correspondingTakeoutEvents)
{
context.ProductBroughtBackEvents.Add(new ProductBroughtBackEvent
{
ProductId = takeoutEvent.ProductId,
Quantity = takeoutEvent.Quantity,
TransactionId = command.TransactionId
});
}
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
}