docs: def form_valid(self, form):
          """
          If the request is ajax, save the form and return a json response.
          Otherwise return super as expected.
          """
          self.object = form.save(commit=False)
          self.pre_save()
          self.object.save()
          if hasattr(form, 'save_m2m'):
              form.save_m2m()
          self.post_save()
  
          if self.request.is_ajax():
              return self.render_json_response(self.get_success_result())
          return HttpResponseRedirect(self.get_success_url())