docs: def process(self, pre_search_condition=None, **kwargs):
          """
          function to be called outside to get the footer search condition,
          apply the search in DB and render the serialized result.
  
          :param pre_search_condition: None/OrderedDict: pre search condition to
            be applied before applying the one getting from footer
          :param kwargs: dict: search parameters got from footer
          :return: dict: contains the filtered data, total number of records,
              number of filtered records and drawing number.
          """
          records = self.query_by_args(pre_search_condition=pre_search_condition,
                                       **kwargs)
          serializer = self.serializer(records['items'], many=True)
          result = {
              'data': serializer.data,
              'draw': records['draw'],
              'recordsTotal': records['total'],
              'recordsFiltered': records['count'],
          }
          return result