public async Task <IEnumerable <TripDto> > Handle(GetTripListQuery request, CancellationToken cancellationToken)
{
var origin = context.Cities.SingleOrDefault(e => e.Id == request.From);
var destination = context.Cities.SingleOrDefault(e => e.Id == request.To);
var predicate = PredicateExpression.True <Trip>();
if (request.From != null)
{
predicate = predicate.And(e => e.Origin.X <= origin.X && e.Origin.Y <= origin.Y);
}
if (request.To != null)
{
predicate = predicate.And(e => e.Destination.X <= destination.X && e.Destination.Y <= destination.Y);
}
var trips = await context.Trips.Where(predicate)
.Include(x => x.Destination)
.Include(x => x.Origin)
.ToListAsync();
return(mapper.Map <List <Trip>, List <TripDto> >(trips));
}