在使用rest api的codeigniter中如何将json数据保存到表中

<?php
class Your_model extends CI_Model {
    public function save_json_data($json_data) {
        $data = array(
            'json_column' => $json_data
        );
        $this->db->insert('your_table', $data);
    }
}

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

require APPPATH . 'libraries/REST_Controller.php';

class Your_controller extends REST_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->model('your_model');
    }

    public function save_json_post() {
        $json_data = $this->post('json_data');
        $this->your_model->save_json_data($json_data);
        $this->response('JSON data saved successfully.', REST_Controller::HTTP_OK);
    }
}

$route['your_controller/save_json'] = 'your_controller/save_json_post';