Uday Kumar uday12kumar

uday12kumar / lock book.py

Created January 28, 2020 12:31

	@classmethod
	def book(cls, id, seats_selected):
	with transaction.atomic():
	if seats < self.seats_selected:
	raise errors.InsufficientSeats()
	slot = (cls.objects.select_for_update().get(id=id))
	slot.seats -= seats_selected
	slot.save()
	return slot

uday12kumar / cancellocked.py

Last active January 28, 2020 12:30


	@classmethod
	def cancel(cls, id, seats_selected):
	with transaction.atomic():
	slot= (cls.objects.select_for_update().get(id=id))
	slot.seats += seats_selected
	slot.save()
	return slot

uday12kumar / naive book and cancel.py

Last active January 28, 2020 12:53

	def book(self, seats_selected,slot_id):
	if self.seats < self.seats_selected:
	raise errors.InsufficientSeats()
	self.seats -= seats_selected
	self.save()


	def cancel_booking(self, seats_selected):
	self.seats += seats_selected
	self.save()

uday12kumar / slot_model.py

Last active January 28, 2020 12:52

Django concurrency

	class Slot(models.Model):
	id = models.AutoField(primary_key=True,)
	user = models.ForeignKey(User)
	seats= models.IntegerField(default=10)