@Override
public Boolean hasNonExpiredRental(Lendable lendable) {
Rental myRental = getMyRental(lendable);
return myRental != null ? !myRental.isExpired() : false;
}
@Override
public boolean returnRentalForLendable(Lendable lendable) {
Rental myRental = getMyRental(lendable);
return myRental != null && !myRental.isExpired() ? myRental.returnToLibrary() : false;
}