code: def _get_formset_data(self):
          
          data = []
          for datum in self.filtered_data:
              form_data = {}
              for column in self.columns.values():
                  value = column.get_data(datum)
                  form_data[column.name] = value
              form_data['id'] = self.get_object_id(datum)
              data.append(form_data)
          return data
docs: Formats the self.filtered_data in a way suitable for a formset.