CRUDlex\MySQLData::getManyIds PHP Method

    protected function getManyIds(array $fields, array $params)
    {
        $manyIds = [];
        foreach ($fields as $field) {
            $thisField = $this->definition->getSubTypeField($field, 'many', 'thisField');
            $thatField = $this->definition->getSubTypeField($field, 'many', 'thatField');
            $queryBuilder = $this->database->createQueryBuilder();
            $queryBuilder->select('`' . $thisField . '`')->from($field)->where('`' . $thatField . '` IN (?)')->setParameter(0, array_column($params[$field], 'id'), Connection::PARAM_STR_ARRAY)->groupBy('`' . $thisField . '`');
            $queryResult = $queryBuilder->execute();
            $manyResults = $queryResult->fetchAll(\PDO::FETCH_ASSOC);
            $manyIds = array_merge($manyIds, array_column($manyResults, $thisField));
        }
        return $manyIds;
    }