code: def get(self, **options):
          
          sub_query = self.with_limit(1)
          options = QueryOptions(sub_query).replace(batch_size=1)
          for result in sub_query.run(**options):
              return result
          return None
docs: Run this query and get the first result.
  
          Parameters:
            \**options(QueryOptions, optional)
  
          Returns:
            Model: An entity or None if there were no results.