public async Task <IEnumerable <(DateTime biddingDate, Bid winningBid)> > GetBiddingWinners(int loanId)
{
var spec = new Specification <Loan>(x => x.Id == loanId);
spec.IncludeStrings.Add("Bids.User.Account");
Loan loan = await _loanRepo.FindFirstAsync(spec);
IEnumerable <(DateTime biddingDate, Bid winningBid)> winners = loan.Bids
.GroupBy(bid => bid.CreatedDate.Date)
.Select(group => (group.Key, MaxByBidAmount(group)));
Bid MaxByBidAmount(IGrouping <DateTime, Bid> group)
{
return(group.Aggregate((item1, item2) => item1.Amount > item2.Amount ? item1 : item2));
}
return(winners);
}