code: def _one_to_many_query(cls, query_obj, search4, model_attrib):
          
          model = model_attrib.parent.class_
  
          already_joined_tables = [mapper.class_ for mapper in query_obj._join_entities]
  
          if isinstance(search4, (str, int, Iterable)) and model not in already_joined_tables:
              query_obj = query_obj.join(model)
  
          if isinstance(search4, str):
              query_obj = query_obj.filter(model_attrib.like(search4))
  
          elif isinstance(search4, int):
              query_obj = query_obj.filter(model_attrib == search4)
  
          elif isinstance(search4, Iterable):
              query_obj = query_obj.filter(model_attrib.in_(search4))
  
          return query_obj
docs: extends and returns a SQLAlchemy query object to allow one-to-many queries
  
          :param query_obj: SQL Alchemy query object
          :param str search4: search string
          :param model_attrib: attribute in model