public RouteModel MapToModel(Route entity) { var airportMapper = new AirportMapper(); var model = new RouteModel { Id = entity.Id, Carrier = new CarrierMapper().MapToModel(entity.Carrier), AirportArrive = airportMapper.MapToModel(entity?.AirportArrive), AirportDepart = airportMapper.MapToModel(entity?.AirportDepart) }; return(model); }