Cakephp使用特定规则验证特定字段,而不保存控制器中的数据

public function validationDefault(Validator $validator)
{
    $validator
        ->integer('id')
        ->allowEmptyString('id', null, 'create');

    $validator
        ->scalar('name')
        ->maxLength('name', 255)
        ->requirePresence('name', 'create')
        ->notEmptyString('name');

    return $validator;
}

public function add()
{
    $user = $this->Users->newEntity();
    if ($this->request->is('post')) {
        $user = $this->Users->patchEntity($user, $this->request->getData());
        if ($this->Users->save($user)) {
            $this->Flash->success(__('The user has been saved.'));

            return $this->redirect(['action' => 'index']);
        }
        $this->Flash->error(__('The user could not be saved. Please, try again.'));
    }
    $this->set(compact('user'));
}

if ($this->Users->save($user)) {
    $this->Flash->success(__('The user has been saved.'));

    return $this->redirect(['action' => 'index']);
} else {
    $this->Flash->error(__('The user could not be saved. Please, try again.'));
}