@Override public List<String> findUserIdsWithConnection(Connection<?> connection) { ConnectionKey key = connection.getKey(); List<SocialUserConnection> socialUserConnections = socialUserConnectionRepository.findAllByProviderIdAndProviderUserId( key.getProviderId(), key.getProviderUserId()); return socialUserConnections .stream() .map(SocialUserConnection::getUserId) .collect(Collectors.toList()); };