Symfony2 形成没有实体的验证器组

我正在使用 Symfony2 表单组件来构建和验证表单。现在我需要根据单个字段值设置验证器组，不幸的是，似乎每个示例都基于实体 - 由于多种原因，我没有使用实体。

例子： 如果任务为空，则应删除所有约束验证器，但如果不是，则应使用默认的验证器集（或验证器组）。

换句话说，我想要实现的目标是使子表单成为可选的，但如果填充了关键字段，则仍然会进行验证。

有人可以给我一个如何配置它的例子吗？

<?php
namespace CoreBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Validator\Constraints as Assert;
use CoreBundle\Form\Type\ItemGroupOption;

class ItemGroup extends AbstractType
{

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('title', 'text', array(
            'label' => 'Titel',
            'attr' => array('class' => 'span10 option_rename'),
            'required' => false
        ));
        $builder->add('max_selections', 'integer', array(
            'label' => 'Max tilvalg',
            'constraints' => array(new Assert\Type('int', array('groups' => array('TitleProvided')))),
            'attr' => array('data-default' => 0)
        ));
        $builder->add('allow_multiple', 'choice', array(
            'label' => 'Tillad flere valg',
            'constraints' => array(new Assert\Choice(array(0,1))),
            'choices'  => array(0 => 'Nej', 1 => 'Ja')
        ));
        $builder->add('enable_price', 'choice', array(
            'label' => 'Benyt pris',
            'constraints' => array(new Assert\Choice(array(0,1))),
            'choices'  => array(0 => 'Nej', 1 => 'Ja'),
            'attr' => array('class' => 'option_price')
        ));
        $builder->add('required', 'choice', array(
            'label' => 'Valg påkrævet',
            'constraints' => array(new Assert\Choice(array(0,1))),
            'choices'  => array(0 => 'Nej', 1 => 'Ja')
        ));
        $builder->add('options', 'collection', array(
            'type' => new ItemGroupOption(),
            'allow_add' => true,
            'allow_delete' => true,
            'by_reference' => false
            )
        );
        $builder->add('sort', 'hidden');
    }

    public function getName()
    {
        return 'item_group';
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        global $app;

        $resolver->setDefaults(array(
            'validation_groups' => function(FormInterface $form) use ($app) {

                // Get submitted data
                $data = $form->getData();

                if (count($app['validator']->validateValue($data['title'], new Assert\NotBlank())) == 0) {
                    return array('TitleProvided');
                } else {
                    return false;
                }
            },
        ));
    }
}

如果您使用的是 2.1，您可能想看看“根据提交的数据进行分组” http://symfony.com/doc/current/book/forms.html#groups-based-on-submitted-data.

Update

使用演示联系页面的示例/demo/contact在默认情况下AcmeDemoBundleSymfony 标准版提供：

具有条件验证组的表单类型：

namespace Acme\DemoBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Validator\Constraints as Assert;

class ContactType extends AbstractType
{
    // Inject the validator so we can use it in the closure
    /**
     * @var Validator
     */
    private $validator;

    /**
     * @param Validator $validator
     */
    public function __construct(Validator $validator)
    {
        $this->validator = $validator;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('email', 'email');
        $builder->add('message', 'textarea', array(
            // Added a constraint that will be applied if an email is provided
            'constraints' => new Assert\NotBlank(array('groups' => array('EmailProvided'))),
        ));
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        // This is needed as the closure doesn't have access to $this
        $validator = $this->validator;

        $resolver->setDefaults(array(
            'validation_groups' => function(FormInterface $form) use ($validator) {
                // Get submitted data
                $data = $form->getData();
                $email = $data['email'];

                // If email field is filled it will not be blank
                // Then we add a validation group so we can also check message field
                if (count($validator->validateValue($email, new Assert\NotBlank())) == 0) {
                    return array('EmailProvided');
                }
            },
        ));
    }

    public function getName()
    {
        return 'contact';
    }
}

不要忘记注入validator服务形式类型：

<?php

namespace Acme\DemoBundle\Controller;

//...

class DemoController extends Controller
{
    // ...

    public function contactAction()
    {
        $form = $this->get('form.factory')->create(new ContactType($this->get('validator')));

        // ...
    }
}

正如您所看到的验证message仅当以下情况时才会触发字段email字段已满。

使用 diff 工具来捕捉差异。