Laravel Backpack基础请求验证失效问题求助

我遇到了一个本以为极易解决的问题——无法让基础请求验证生效。在创建表单和编辑表单中输入"Bob"时，没有任何错误提示，数据直接插入数据库。我觉得自己可能犯了低级错误，以下是我的代码：

UserCrudController.php #

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Requests\UserRequest;
use Backpack\CRUD\app\Http\Controllers\CrudController;
use Backpack\CRUD\app\Library\CrudPanel\CrudPanelFacade as CRUD;

/**
 * Class UserCrudController
 * @package App\Http\Controllers\Admin
 * @property-read \Backpack\CRUD\app\Library\CrudPanel\CrudPanel $crud
 */
class UserCrudController extends CrudController
{
    use \Backpack\CRUD\app\Http\Controllers\Operations\ListOperation;
    use \Backpack\CRUD\app\Http\Controllers\Operations\CreateOperation;
    use \Backpack\CRUD\app\Http\Controllers\Operations\UpdateOperation;
    use \Backpack\CRUD\app\Http\Controllers\Operations\DeleteOperation;
    use \Backpack\CRUD\app\Http\Controllers\Operations\ShowOperation;

    /**
     * Configure the CrudPanel object. Apply settings to all operations.
     * 
     * @return void
     */
    public function setup()
    {
        CRUD::setModel(\App\Models\User::class);
        CRUD::setRoute(config('backpack.base.route_prefix') . '/user');
        CRUD::setEntityNameStrings('user', 'users');
    }

    /**
     * Define what happens when the List operation is loaded.
     * 
     * @return void
     */
    protected function setupListOperation()
    {
        CRUD::column('name');
        CRUD::column('email');
        //CRUD::column('password');

        /**
         * Columns can be defined using the fluent syntax or array syntax:
         * - CRUD::column('price')->type('number');
         * - CRUD::addColumn(['name' => 'price', 'type' => 'number']); 
         */
    }

    /**
     * Define what happens when the Create operation is loaded.
     * 
     * @return void
     */
    protected function setupCreateOperation()
    {
        CRUD::setValidation(UserRequest::class);

        CRUD::field('name');
        CRUD::field('email');
        //CRUD::field('password');

        /**
         * Fields can be defined using the fluent syntax or array syntax:
         * - CRUD::field('price')->type('number');
         * - CRUD::addField(['name' => 'price', 'type' => 'number'])); 
         */
    }

    /**
     * Define what happens when the Update operation is loaded.
     * 
     * @return void
     */
    protected function setupUpdateOperation()
    {
        $this->setupCreateOperation();
    }
}

UserRequest.php #

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class UserRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        // only allow updates if the user is logged in
        return backpack_auth()->check();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'name' => ['required','min:5','max:255'],
        ];
    }

    /**
     * Get the validation attributes that apply to the request.
     *
     * @return array
     */
    public function attributes()
    {
        return [
            //
        ];
    }

    /**
     * Get the validation messages that apply to the request.
     *
     * @return array
     */
    public function messages()
    {
        return [
            //
        ];
    }
}

内容的提问来源于stack exchange，提问作者Just Bob