这是我第一次在CI 4中使用模型。下面的模型在获取数据时工作，也更新一个删除的记录。但由于某种原因，它不验证任何输入数据。我可以让字段为空或用单个字符填充它们，它们仍然会更新。同样，当它们更新$updatedField时，它不会改变（保持NULL）。

<?php

namespace App\Models;

use CodeIgniter\Model;

class GroupsModel extends Model
{
    protected $DBGroup = 'default';
    protected $table      = 'auth_groups';
    protected $primaryKey = 'id';

    protected $useAutoIncrement = true;

    protected $returnType     = 'array';
    protected $useSoftDeletes = true;

    protected $allowedFields = ['name', 'description'];

    protected $useTimestamps = true;
    protected $createdField  = 'created_at';
    protected $updatedField  = 'updated_at';
    protected $deletedField  = 'deleted_at';

    protected $validationRules    = [
        'name'        => 'required|min_length[3]|is_unique[auth_groups.name]',
        'description'     => 'required|min_length[3]',
    ];

    protected $validationMessages = [
        'name'        => [
            'is_unique' => 'Name has to be unique',
        ],
    ];
    protected $skipValidation     = false;
}

下面是控制器中的相关代码：

$groupmodel=new GroupModel();
                $group = $groupmodel->find($_GET["id"]);
                if(is_null($group)){throw \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound();}
                if($_SERVER['REQUEST_METHOD'] == 'POST'){$groupmodel->update($_GET["id"],$_POST);}
                helper('form');
                $data = [
                    'username'  =>  user()->username,
                    'title'    =>  'Groups',
                    'group'    =>  $group,
                    'errors'    =>  $groupmodel->errors(),
                ];
                echo view('panel/header', $data);
                echo view('panel/admin/group_edit', $data);
                echo view('panel/footer', $data);

下面是表格：

CREATE TABLE `auth_groups` (
  `id` int UNSIGNED NOT NULL,
  `name` varchar(255) NOT NULL,
  `description` varchar(255) NOT NULL,
  `created_at` datetime NOT NULL,
  `updated_at` datetime DEFAULT NULL,
  `deleted_at` datetime DEFAULT NULL
)

期待您的反馈！