public static async Task <long> GetAnsweredToday(IReader reader, Guid userId, IClock clock)
{
DateTimeOffset now = clock.Now();
var start = new DateTimeOffset(now.Year, now.Month, now.Day, 0, 0, 0, 0, new TimeSpan(0));
var end = new DateTimeOffset(now.Year, now.Month, now.Day, 23, 59, 59, 999, new TimeSpan(0));
// Possible performance optimization: Return after reaching the max count.
// That way not every question has to be searched.
return(await reader.CountAsync <Question>(q => q.AnsweredBy.Any(a => a.UserId == userId && a.AnsweredAt <= end && a.AnsweredAt >= start)));
}
