public async Task <UserBalanceQueryResult> Ask(UserBalanceCriterion criterion)
{
var balance = await _queryBuilder
.ForGeneric <UserBalance>()
.Where(UserBalanceSpecifications.WithNonZeroId())
.FirstOrDefaultAsync();
return(new UserBalanceQueryResult(balance?.Balance ?? 0));
}
public async Task <Result> Handle(ChangeBalanceCmd message)
{
var aggregate = await _repository
.FindOne(UserBalanceSpecifications.WithNonZeroId());
aggregate ??= _repository.Create();
return(await aggregate.ChangeBalance(message.Amount)
.Tap(async aggr =>
{
if (!aggregate.IsNew)
{
_repository.Update(aggr);
}
await _domainUow.Commit();
}));
}