I have this django class-based view where i am trying to overwrite the get_queryset function because i want get to the inserted values from the frontend to search in my database after the subject with that name and then get the id. but when i call the view it gives me a "Subject matching query does not exist." because the subject_val is None. That makes sense because the user has not submitted the values jet.. so how do i get it to wait until a user have choosen "submit
class AttendanceList(LoginRequiredMixin, ListView):
model = AttendanceLog
template_name = "./attendancecode/showattendance.html"
def get_queryset(self):
class_val = self.request.GET.get('class')
subject_val = self.request.GET.get('subject')
sub = Subject.objects.get(name=subject_val).id
new_context = get_statstic(class_val, sub)
return new_context
def get_context_data(self, **kwargs):
context = super(AttendanceList, self).get_context_data(**kwargs)
context['class'] = self.request.GET.get('class')
context['subject'] = self.request.GET.get('subject')
return contextYou can check if the values are not None, in case they are, you need to return another queryset of AttendanceLogs (for example AttendanceLog.objects.all() or AttendanceLog.objects.none()):
class AttendanceList(LoginRequiredMixin, ListView):
model = AttendanceLog
template_name = "./attendancecode/showattendance.html"
def get_queryset(self):
class_val = self.request.GET.get('class')
subject_val = self.request.GET.get('subject')
if class_val is not None and subject_val is not None:
sub = Subject.objects.get(name=subject_val).id
return get_statstic(class_val, sub)
# return another queryset:
return AttendanceLog.objects.none()
# …