public function getOneById($id)
    {
        $id = (string)$id;

        $fields = implode(', ', $this->fields);
        $sql = 'SELECT ' . $fields . ' FROM ' . $this->table . ' WHERE ' . $this->table . '.id = :id';
        $query = $this->pdo->prepare($sql);
        $query->bindParam(':id', $id);
        $query->execute();

        return $query->fetch(PDO::FETCH_ASSOC);
    }