CodeIgniter表单验证：处理数组类型输入字段的“无法找到验证规则”错误

<!-- 客户端HTML/JavaScript 代码片段 -->
<div id="yearDiv" class="form-group">
   <div class="form-group">
       <label for="yearList">Study Years</label>
       <input type="text" class="form-control" id="yearList">
    </div> 
    <div class="form-group row">
       <div class="col-md-2">
           <label for="startYearBox">Start Year</label>
           <input type="text" class="form-control" id="startYearBox">
       </div>
       <div class="col-md-2">
           <label for="endYearBox">End Year</label>
           <input type="text" class="form-control" id="endYearBox">
       </div> 
       <div class="col-md-8"><small>(Use present for End Year if study is ongoing.)</small>
       </div>
   </div>                
</div> 

<script type='text/javascript'>
var data = {};
data['years']={}; // 定义一个名为 'years' 的对象
data['years']['intStartYr']= $('#startYearBox').val(); // 设置子字段 'intStartYr'
data['years']['intEndYr']= $('#endYearBox').val();   // 设置子字段 'intEndYr'

var posturl = '<?php echo site_url('manage/climate_indicators/updateStudyYears');?>'

$.when($.ajax({type: "POST", url: posturl, data:data, dataType: 'json'})).done(function(result) {
     console.log(result.status);
});
</script>

// 服务器端 CodeIgniter 控制器代码片段 (原问题中的错误示例)
public function updateStudyYears() {
    if (!$this->input->post() OR !$this->input->is_ajax_request() ){
        echo json_encode(array('status'=>'failed','errors'=>array('Access Mode'=>'Disallowed')));
        exit();
    } else {
        $postData = $this->input->post(NULL, true); // 获取所有POST数据，并进行XSS过滤
        $yearArray = $postData['years'];

        if(empty($yearArray)) {
            echo json_encode(array('status'=>'failed', 'errors'=>'Years are empty'));
            exit();
        }    

        // 错误的 set_rules 调用
        $this->form_validation->set_rules('years[intStartYr]', 'Start Year', 'required',
                array('required' => 'Start year must have a valid year.'));
        $this->form_validation->set_rules('years[intEndYr]', 'End Year', 'required',
                array('required' => 'End year must have a valid year.'));

        if ($this->form_validation->run() === FALSE) {  
            $validationErrs = $this->form_validation->error_array();
            echo json_encode(array('status'=>'form-errors', 'valErrs'=>$validationErrs));                
            exit;
        } else {                        
            $status = $this->climate_indicators_model->setStudyYears($yearArray);            
            if ($status) {
                echo json_encode(array('status'=>'success', 'message'=>'Study year information successfully updated.'));                    
            } else {
                echo json_encode(array('status'=>'failed', 'errors'=>'Db error on update'));
            }
        }
        exit();
    }
}

// 修正后的 set_rules 调用
$this->form_validation->set_rules("years['intStartYr']", 'Start Year', 'required',
        array('required' => 'Start year must have a valid year.'));
$this->form_validation->set_rules("years['intEndYr']", 'End Year', 'required',
        array('required' => 'End year must have a valid year.'));

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

class Manage extends CI_Controller { // 假设控制器名为 Manage

    public function __construct() {
        parent::__construct();
        // 载入 form_validation 库
        $this->load->library('form_validation');
        // 载入 input 库（通常是自动加载的，但显式载入更清晰）
        $this->load->library('input');
        // 载入模型（根据你的实际模型名称）
        $this->load->model('climate_indicators_model');
    }

    public function updateStudyYears() {
        // 1. 权限和请求类型检查
        if (!$this->input->post() OR !$this->input->is_ajax_request() ){
            echo json_encode(array('status'=>'failed','errors'=>array('Access Mode'=>'Disallowed')));
            exit();
        } else {
            // 2. 获取并过滤POST数据
            $postData = $this->input->post(NULL, true); // 获取所有POST数据，并进行XSS过滤

            // 确保 'years' 键存在且是数组，避免因未定义索引导致的PHP警告
            $yearArray = isset($postData['years']) && is_array($postData['years']) ? $postData['years'] : [];

            if(empty($yearArray)) {
                echo json_encode(array('status'=>'failed', 'errors'=>'Years data is empty or invalid'));
                exit();
            }    

            // 3. 设置表单验证规则 (已修正)
            $this->form_validation->set_rules("years['intStartYr']", 'Start Year', 'required',
                    array('required' => 'Start year must have a valid year.'));
            $this->form_validation->set_rules("years['intEndYr']", 'End Year', 'required',
                    array('required' => 'End year must have a valid year.'));

            // 4. 运行验证
            if ($this->form_validation->run() === FALSE) {  
                $validationErrs = $this->form_validation->error_array();
                echo json_encode(array('status'=>'form-errors', 'valErrs'=>$validationErrs));                
                exit;
            } else {                        
                // 5. 验证通过，处理业务逻辑
                $status = $this->climate_indicators_model->setStudyYears($yearArray);            
                if ($status) {
                    echo json_encode(array('status'=>'success', 'message'=>'Study year information successfully updated.'));                    
                } else {
                    echo json_encode(array('status'=>'failed', 'errors'=>'Database error on update'));
                }
            }
            exit(); // 确保脚本在此处终止
        }
    }
}