Ouzo\Restriction\IsInRestriction::toSql PHP Метод

    public function toSql($fieldName)
    {
        if (!count($this->values) > 0) {
            return null;
        }
        $placeholders = implode(', ', array_fill(0, count($this->values), '?'));
        return $fieldName . ' IN(' . $placeholders . ')';
    }