public function selectArrayWithRolesString(string $columns = "*", array $whereColumnsInfo = null): array
    {
        $administrators = [];
        $results = $this->selectArray($columns, $whereColumnsInfo);
        foreach ($results as $index => $administrator) {
            $administrators[$index] = $administrator;
            $administrators[$index]['roles'] = implode(", ", $administrators[$index]['roles']);
        }
        return $administrators;
    }