在模型中使用validationRules验证表单Codeigniter4

namespace App\Models;

use CodeIgniter\Model;

class UserModel extends Model
{
    protected $validationRules = [
        'username' => 'required|min_length[5]|max_length[20]',
        'email'    => 'required|valid_email',
        'password' => 'required|min_length[8]',
    ];

    // 其他模型代码...
}

namespace App\Models;

use CodeIgniter\Model;

class UserModel extends Model
{
    // ...

    public function saveUser($data)
    {
        if (!$this->validate($data, $this->validationRules)) {
            return $this->validator->getErrors();
        }

        // 保存用户数据的逻辑...

        return true;
    }

    // ...
}

namespace App\Controllers;

use App\Models\UserModel;

class UserController extends BaseController
{
    public function save()
    {
        $userModel = new UserModel();

        $data = [
            'username' => $this->request->getPost('username'),
            'email'    => $this->request->getPost('email'),
            'password' => $this->request->getPost('password'),
        ];

        $result = $userModel->saveUser($data);

        if ($result === true) {
            // 保存成功的逻辑...
        } else {
            // 验证失败，处理错误信息...
        }
    }
}