如何动态地配置验证组

// src/AppBundle/Validation/ValidationGroupResolver.php
namespace AppBundle\Validation;
 
use Symfony\Component\Form\FormInterface;
 
class ValidationGroupResolver
{
    private $service1;
 
    private $service2;
 
    public function __construct($service1, $service2)
    {
        $this->service1 = $service1;
        $this->service2 = $service2;
    }
 
    /**
     * @param FormInterface $form
     * @return array
     */
    public function __invoke(FormInterface $form)
    {
        $groups = array();
 
        // ... determine which groups to apply and return an array
        // ... 决定要应用哪一组，并返回一个数组
 
        return $groups;
    }
}

// src/AppBundle/Form/MyClassType.php;
namespace AppBundle\Form;
 
use AppBundle\Validator\ValidationGroupResolver;
use Symfony\Component\Form\AbstractType
use Symfony\Component\OptionsResolver\OptionsResolver;
 
class MyClassType extends AbstractType
{
    private $groupResolver;
 
    public function __construct(ValidationGroupResolver $groupResolver)
    {
        $this->groupResolver = $groupResolver;
    }
 
    // ...
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'validation_groups' => $this->groupResolver,
        ));
    }
}