code: def form_valid(self, post_form, attachment_formset, poll_option_formset, **kwargs):
          
          save_poll_option_formset = poll_option_formset is not None \
              and not self.preview
  
          valid = super().form_valid(
              post_form, attachment_formset, poll_option_formset=poll_option_formset, **kwargs)
  
          if save_poll_option_formset:
              poll_option_formset.topic = self.forum_post.topic
              poll_option_formset.save(
                  poll_question=post_form.cleaned_data.pop('poll_question', None),
                  poll_max_options=post_form.cleaned_data.pop('poll_max_options', None),
                  poll_duration=post_form.cleaned_data.pop('poll_duration', None),
                  poll_user_changes=post_form.cleaned_data.pop('poll_user_changes', None),
              )
  
          return valid
docs: Processes valid forms.