// constructor for new rental
// add initial instance in separate action
public Rental(int id, Locker locker, Renter renter)
{
this.locker = locker;
this.renter = renter;
Id = id;
StartDate = DateTime.Now.Date;
RentalDateTime = DateTime.Now;
Status = RentalStatus.Active;
}
// constructor for existing rental
public Rental(int id, Locker locker, Renter renter, DateTime startDate, DateTime rentalDateTime, RentalStatus status, List <Instance> instances)
{
this.locker = locker;
this.renter = renter;
this.instances = instances;
Id = id;
StartDate = startDate;
RentalDateTime = rentalDateTime;
Status = status;
}