Symfony 形式中的多个、依赖的一对多关系

Question

我正在尝试使多重关系（多个、依赖的一对多关系）形式工作，但没有成功。我正在使用带有 FOSUserbundle 的 Symfony 2.3。

实体用户

    use FOS\UserBundle\Entity\User as BaseUser;
    [...]

    /**
     * @ORM\Entity
     * @Gedmo\Loggable
     * @ORM\Table(name="ta_user", indexes={@ORM\Index(name="IDX_LOGIN_TOKEN", columns={"login_token"})})
     */
    class User extends BaseUser
    {
            [...]

        /**
         * @ORM\OneToMany(targetEntity="UserLifestyle", mappedBy="user", fetch="LAZY", cascade={"persist", "remove"})
         */
        protected $lifestyle;

用户管理器

    use Doctrine\ORM\EntityManager;
    use FOS\UserBundle\Entity\UserManager as BaseUserManager;
    use Acme\UserBundle\Entity\LifestyleQuestion;
    use Acme\UserBundle\Entity\UserLifestyle;
    [...]

    class UserManager extends BaseUserManager {
        public function createUser() {
            $user = parent::createUser();
            $lifestyle = new UserLifestyle();
            $lifestyle->setQuestion($this->objectManager->getReference('Acme\UserBundle\Entity\LifestyleQuestion', 1));
            $user->addLifeStyle($lifestyle);
            $lifestyle = new UserLifestyle();
            $lifestyle->setQuestion($this->objectManager->getReference('Acme\UserBundle\Entity\LifestyleQuestion', 2));
            $user->addLifeStyle($lifestyle);
            $lifestyle = new UserLifestyle();
            $lifestyle->setQuestion($this->objectManager->getReference('Acme\UserBundle\Entity\LifestyleQuestion', 3));
            $user->addLifeStyle($lifestyle);
            return $user;
        }

实体用户生活方式

    /**
     * @ORM\Entity
     * @Gedmo\Loggable
     * @ORM\Table(name="ta_user_lifestyle")
     */
    class UserLifestyle
    {
        /**
         * @ORM\Id
         * @ORM\Column(type="smallint")
         * @ORM\GeneratedValue(strategy="AUTO")
         */
        protected $id;

        /**
         * @ORM\ManyToOne(targetEntity="User", inversedBy="lifestyle")
         * @ORM\JoinColumn(name="user_id")
         */
        protected $user;

        /**
         * @ORM\ManyToOne(targetEntity="LifestyleQuestion", inversedBy="answeredByUser")
         * @ORM\JoinColumn(name="question_id")
         */
        protected $question;

        /**
         * @ORM\ManyToOne(targetEntity="LifestyleAnswer", inversedBy="userAnswers")
         * @ORM\JoinColumn(name="answer_id")
         * @Gedmo\Versioned
         */
        protected $answer;

然后，有一个表单类型

    use Symfony\Component\Form\AbstractType;
    use Symfony\Component\Form\FormBuilderInterface;
    use Symfony\Component\OptionsResolver\OptionsResolverInterface;
    use Doctrine\ORM\EntityRepository;

    class RegistrationType extends AbstractType
    {
        public function buildForm(FormBuilderInterface $builder, array $options)
        {
            $builder
                ->add('email', NULL, array('label' => 'E-Mail'))
                            [...]
                ->add('lifestyle', 'collection', array(
                    'type' => new RegistrationLifestyleType(),
                    'allow_add' => false,
                    'allow_delete' => false,
                    'label' => false,
                ))

现在应该有一个相关的RegistrationLifestyleType。但我不知道它应该是什么样子。我希望在我的注册表单中有三个选择字段，显示与这些问题相关的一个问题（作为标签）和一堆答案（作为选择字段）。 UserManager 将三个问题分配给新创建的用户，因此可以通过以下方式获得问题：

    $lifestyles = $user->getLifestyles();
    foreach ($lifestyles as $lifestyle) {
        $question = $lifestyle->getQuestion(); // echo $question->getQuestion();
        $answers = $lifestyle->getQuestion()->getAnswers(); // loop through $answers and echo $answer->getAnswer();
    }

但是我如何修改表单类型以使其正常工作。重要提示：我的意图是尽可能使用内置功能，并尝试通过注入服务容器和实体管理器来避免夸大表单类型和其他类型。

Answer 1

找到一个解决方案，也许有人可以使用它。问题似乎是，LifestyleQuestion 和 LifestyleAnswer 在同一个对象（UserLifestyle）上是 1:n 关系，所以 Symfony 不知道如何处理它，即使我将 LifestyleQuestion 设置为特定问题在UserManager 已经。关于https://stackoverflow.com/a/9729888/672452，必须使用表单侦听器，因此父对象在子表单中可用。所以这是我的“简单”RegistrationLifestyleType（不使用任何注入的容器或管理器）：

use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Form\FormBuilderInterface;
use Doctrine\ORM\EntityRepository;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Security\Core\SecurityContext;

class RegistrationLifestyleType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options) {
        $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) use ($builder) {
            $form = $event->getForm();
            $lifestyle = $event->getData();
            if (!($lifestyle instanceof \Acme\UserBundle\Entity\UserLifestyle) || !$lifestyle->getQuestion()) return;
            $label = $lifestyle->getQuestion()->getQuestion();
            $questionId = $lifestyle->getQuestion()->getId();
            $form->add('answer', 'entity', array(
                'class' => 'AcmeUserBundle:LifestyleAnswer',
                'empty_value' => '',
                'property' => 'answer',
                'query_builder' => function(EntityRepository $er) use ($questionId) {
                    return $er
                        ->createQueryBuilder('t1')
                        ->andWhere('t1.question = :question')
                        ->setParameter('question', $questionId)
                        ->orderBy('t1.answer', 'ASC')
                    ;
                },
                'label' => $label,
            ));
        });
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Acme\UserBundle\Entity\UserLifestyle',
            'error_bubbling' => false,
        ));
    }
}