def return_rental(librarian, rental_id):
'''
Desc:
librarian receives book from rental
Args:
librarian - User instance: accepts returnal
rental_id - id of rental being ended
'''
returned_rental = get_object_or_404(Rental, id=rental_id)
# not everyone can return book
if not librarian.has_perm('baseapp.change_rental'):
raise PermissionDenied
if not librarian in returned_rental.reservation.book_copy.location.get_all_maintainers():
raise PermissionDenied('One can only rent/return from location one maintains')
# can't return a rental twice
if returned_rental.end_date is not None:
raise Rental.DoesNotExist('Rental already returned')
# actual returning
returned_rental.who_received = librarian
returned_rental.end_date = utils.now()
returned_rental.save()
mark_available(returned_rental.reservation.book_copy) # someone might be waiting for that book
def generate_new_password(self):
'''
Generates new password and returns it.
'''
from datetime import datetime
from hashlib import md5
value_to_hash = repr(utils.now()) + self.user.email
new_password = md5(value_to_hash).hexdigest()
return new_password
def cancel_reservation(reservation, user):
if reservation.for_whom != user and not user.has_perm("baseapp.change_reservation") or\
user == reservation.for_whom and not user.has_perm("baseapp.change_own_reservation"):
raise PermissionDenied
if reservation.rental_set.count() > 0:
raise PermissionDenied('The reservation has already been purchased!')
reservation.who_cancelled = user
reservation.when_cancelled = utils.now()
reservation.save()
def cancel_reservation(reservation, canceller):
'''
Desc:
Cancels reservation.
Arg:
reservation - instance of Reservation. Reservation to be cancelled.
canceller - instance of User. User who cancels the reservation.
'''
assert isinstance(reservation, Reservation)
assert isinstance(canceller, User)
reservation.when_cancelled = utils.now()
reservation.who_cancelled = request.user
reservation.save()
def rent(reservation, librarian):
'''
Desc:
Librarian rents book indicated by reservation. Return value says when it is supposed to be returned
'''
if not librarian.has_perm('baseapp.add_rental'):
raise PermissionDenied
if not librarian in reservation.book_copy.location.get_all_maintainers():
raise PermissionDenied('One can only rent from location one maintains')
if not is_reservation_rentable(reservation):
raise PermissionDenied('Reservation not rentable.')
max_end_date = utils.today() + timedelta(reservation_status(reservation)-1) # return one day before it's reserved
if max_end_date < reservation.end_date:
reservation.end_date = max_end_date
reservation.save()
rental = Rental(reservation=reservation, who_handed_out=librarian, start_date=utils.now())
rental.save()
mail.made_rental(rental)
return reservation.end_date
