public IEnumerable <DriverTripSummary> GetDriverTripSummaries()
{
var nonzeroSummaries = AllTrips.GroupBy(t => t.DriverName).Select(g => new DriverTripSummary()
{
DriverName = g.Key,
TotalDistance = g.Sum(t => t.MilesDriven),
TotalMinutes = Convert.ToInt32(g.Sum(t => bs.GetMinutesElapsed(t))) // convert the sum rather than each item
});
//This is a little strange because strings aren't unique; would be much better to do this with Ids. See comment in Driver class
var usersWithNoTrips = AllRegisteredDrivers.Select(x => x.Name).Except(nonzeroSummaries.Select(y => y.DriverName));
var summariesForUsersWithNoTrips = usersWithNoTrips.Select(u => new DriverTripSummary()
{
DriverName = u // other fields will default to 0
});
return(nonzeroSummaries.Concat(summariesForUsersWithNoTrips));
}
/// <summary>
/// This actually persists the driver in the database.
/// </summary>
/// <param name="d">A vetted, bona fide new driver</param>
private void ActuallyRegisterDriver(Driver d)
{
AllRegisteredDrivers.Add(d);
}