code: def dispatch(self,request,*args,**kwargs):
          '''
          Handle the session data passed by the prior view.
          '''
  
          lessonSession = request.session.get(PRIVATELESSON_VALIDATION_STR,{})
  
          try:
              self.lesson = PrivateLessonEvent.objects.get(id=lessonSession.get('lesson'))
          except (ValueError, ObjectDoesNotExist):
              messages.error(request,_('Invalid lesson identifier passed to sign-up form.'))
              return HttpResponseRedirect(reverse('bookPrivateLesson'))
  
          expiry = parse_datetime(lessonSession.get('expiry',''),)
          if not expiry or expiry < timezone.now():
              messages.info(request,_('Your registration session has expired. Please try again.'))
              return HttpResponseRedirect(reverse('bookPrivateLesson'))
  
          self.payAtDoor = lessonSession.get('payAtDoor',False)
          return super(PrivateLessonStudentInfoView,self).dispatch(request,*args,**kwargsf dispatch(self,request,*args,**kwargs):
          '''
          Handle the session data passed by the prior view.
          '''
  
          lessonSession = request.session.get(PRIVATELESSON_VALIDATION_STR,{})
  
          try:
              self.lesson = PrivateLessonEvent.objects.get(id=lessonSession.get('lesson'))
          except (ValueError, ObjectDoesNotExist):
              messages.error(request,_('Invalid lesson identifier passed to sign-up form.'))
              return HttpResponseRedirect(reverse('bookPrivateLesson'))
  
          expiry = parse_datetime(lessonSession.get('expiry',''),)
          if not expiry or expiry < timezone.now():
              messages.info(request,_('Your registration session has expired. Please try again.'))
              return HttpResponseRedirect(reverse('bookPrivateLesson'))
  
          self.payAtDoor = lessonSession.get('payAtDoor',False)
          return super(PrivateLessonStudentInfoView,self).dispatch(request,*args,**kwargs)
docs: Handle the session data passed by the prior view.