In this view, rather than raising a 404 if a piece of data is missing, I redirect back to a page where the user can specify the value.<\/p>\n
def list_session(request):\r\n event_id = request.session.get('event_id',None)\r\n try:\r\n event = Event.objects.get(pk=event_id)\r\n except: #No event - back to staff page to select\r\n return HttpResponseRedirect(reverse('staff'))\r\n\r\n queryset = B2CSession.objects.filter(event = event)\r\n\r\n params = {'queryset': queryset,\r\n 'paginate_by': DEFAULT_PAGINATION,\r\n 'template_name': 'session_list.html',\r\n 'extra_context': {'event': event,\r\n 'session': session}}\r\n return object_list(request, **params)<\/pre>\nI wanted to implement this same functionality using a class based view, so I looked into the available methods to override. The dispatch<\/code> method was really the only choice. My solution:<\/p>\ndef dispatch(self, request, *args, **kwargs):\r\n ## If there is no event_id set in the session, return to staff page for a chance to select one\r\n try:\r\n self.event = Event.objects.get(pk=request.session.get('event_id',None))\r\n except Event.DoesNotExist:\r\n return HttpResponseRedirect(reverse('staff'))\r\n ## Normal processing\r\n return super(ListSessionView, self).dispatch(request, *args, **kwargs) <\/pre>\nWhat do you think? Is this the best way to make this work? Leave your comments below.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this view, rather than raising a 404 if a piece of data is missing, I redirect back to a page where the user can specify the value. def list_session(request): event_id = request.session.get(‘event_id’,None) try: event = Event.objects.get(pk=event_id) except: #No event – back to staff page to select return HttpResponseRedirect(reverse(‘staff’)) queryset = B2CSession.objects.filter(event = event) params … <\/p>\n