CakePHP 4-如何验证需要将数据保存到多个表的表单

// src/Model/Table/UsersTable.php
namespace App\Model\Table;

use Cake\ORM\Table;

class UsersTable extends Table
{
    public function initialize(array $config): void
    {
        $this->hasOne('UserProfiles');
    }
}

// src/Model/Table/UsersTable.php
namespace App\Model\Table;

use Cake\Validation\Validator;

class UsersTable extends Table
{
    // ...

    public function validationDefault(Validator $validator): Validator
    {
        $validator
            ->notEmpty('username')
            ->add('username', 'unique', ['rule' => 'validateUnique', 'message' => 'This username has already been taken.']);

        $validator
            ->notEmpty('email')
            ->add('email', 'unique', ['rule' => 'validateUnique', 'message' => 'This email has already been taken.']);

        return $validator;
    }
}

// src/Model/Table/UserProfilesTable.php
namespace App\Model\Table;

use Cake\Validation\Validator;

class UserProfilesTable extends Table
{
    public function validationDefault(Validator $validator): Validator
    {
        $validator
            ->notEmpty('first_name')
            ->notEmpty('last_name');

        return $validator;
    }
}

// src/Controller/UsersController.php
namespace App\Controller;

use App\Model\Table\UsersTable;
use Cake\Http\Exception\BadRequestException;
use Cake\Http\Response;
use Cake\Http\ServerRequest;

class UsersController extends AppController
{
    public function add(ServerRequest $request, Response $response): Response
    {
        $user = $this->Users->newEmptyEntity();
        if ($this->request->is('post')) {
            $user = $this->Users->patchEntity($user, $request->getData(), [
                'associated' => ['UserProfiles']
            ]);

            if ($this->Users->saveAssociated($user)) {
                return $response->withStatus(201)->withStringBody('User created successfully.');
            }

            throw new BadRequestException('There were validation errors.');
        }

        $this->set('user', $user);
    }
}