def get_follower_list(data, username, db_session):
logger.info(LogMsg.START, username)
result = []
user = check_user(username, db_session)
if user is None:
raise Http_error(400, Message.INVALID_USER)
if user.person_id is None:
logger.error(LogMsg.USER_HAS_NO_PERSON, username)
raise Http_error(400, Message.Invalid_persons)
validate_person(user.person_id, db_session)
logger.debug(LogMsg.PERSON_EXISTS)
if data.get('sort') is None:
data['sort'] = ['creation_date-']
if data.get('filter') is None:
data.update({'filter': {'following_id': user.person_id}})
else:
data['filter'].update({'following_id': user.person_id})
res = Follow.mongoquery(db_session.query(Follow)).query(**data).end().all()
for item in res:
result.append(follow_to_dict(item))
logger.debug(LogMsg.FOLLOWER_LIST, result)
logger.info(LogMsg.END)
return result
