我几乎拥有它.如果其他任何人需要这里需要添加的内容,以便在编辑现有项目时使此解决方案完美运行： @H_502_15@class ItemDetailForm extends AbstractType { ... $builder->addEventListener(FormEvents::POST_SET_DATA,function (DataEvent $event) use ($refreshTopic) { $data = $event->getData(); $form = $event->getForm(); if (null === $data) { return; } $form->get('region')->setData($data->getCity()->getRegion()); }); }

编辑：自symfony 2.1以来,在将子项添加到表单之前调用POST_SET_DATA事件,导致所有get(‘region’)引发异常.
解决方案是在POST_SET_DATA中而不是在buildForm()中创建此字段：

@H_502_15@/** @var FormFactory $factory */ $form->add($factory->createNamed('region','entity',null,array( 'class'=>'AcmeBundle:Region','property_path'=>false,'empty_value'=>'Choose a value','required'=>true,'label'=>'Region' )));

请注意,您需要将$factory添加到处理事件的闭包的’use’：

@H_502_15@$builder->addEventListener(FormEvents::POST_SET_DATA,function (DataEvent $event) use ($refreshTopic,$factory) {

这是整个表单类：

@H_502_15@<?PHP namespace AAA\CoreBundle\Form; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\FormBuilderInterface; use Symfony\Component\Form\FormFactory; use Symfony\Component\Form\FormEvents; use Symfony\Component\Form\FormEvent; use Symfony\Component\Form\Form; use Symfony\Component\OptionsResolver\OptionsResolverInterface; use Doctrine\ORM\EntityRepository; use AAA\CoreBundle\Entity\ClassYear; use AAA\CoreBundle\Entity\Field; use AAA\CoreBundle\Entity\Lesson; use AAA\CoreBundle\Form\LessonContentForm; class LessonDetailForm extends AbstractType { public $country; function __construct($country=null) { // Get country for classyear dropdown list $this->country = $country; } public function buildForm(FormBuilderInterface $builder,array $options) { $factory = $builder->getFormFactory(); $builder->add('name',array('label'=>'Titre de la leçon')); $builder->add('description','textarea',array('label'=>'Description (définition conceptuelle) Qu\'est-ce que c\'est ? Et à quoi ça sert ? (importance,utilité)')); $builder->add('text',array('label'=>'Leçon','required'=>false)); // Can't set 'required' on textareas used by TinyMCE $builder->add('reperes',array('label'=>'Repères (détectionel) - Quels sont les éléments qui me permettent de repérer que je dois penser à ce concept ?','required'=>false)); $builder->add('other_topic',array( 'required' => false,'mapped' => false )); $refreshField = function ($form,$classyear) use ($factory) { /** @var FormFactory $factory */ /** @var Form $form */ $form->add($factory->createNamed('field',array( 'class' => 'AAA\CoreBundle\Entity\Field','mapped' => false,'label' => 'Matière','empty_value' => 'Sélectionne une valeur','empty_data' => null,'required' => false,'query_builder' => function (EntityRepository $repository) use ($classyear) { $qb = $repository->createQueryBuilder('field') ->innerJoin('field.classyear','classyear'); if($classyear instanceof ClassYear) { $qb = $qb->where('field.classyear = :classyear') ->setParameter('classyear',$classyear); } elseif(is_numeric($classyear)) { $qb = $qb->where('classyear.id = :classyear_id') ->setParameter('classyear_id',$classyear); } else { $qb = $qb->where('0 = 1'); } return $qb; } ))); }; $refreshTopic = function ($form,$field) use ($factory) { /** @var FormFactory $factory */ /** @var Form $form */ $form->add($factory->createNamed('topic',array( 'class' => 'AAA\CoreBundle\Entity\Topic','property' => 'name','label' => 'Sujet','query_builder' => function (EntityRepository $repository) use ($field) { $qb = $repository->createQueryBuilder('topic') ->innerJoin('topic.field','field'); if($field instanceof Field) { $qb = $qb->where('topic.field = :field') ->setParameter('field',$field); } elseif(is_numeric($field)) { $qb = $qb->where('field.id = :field_id') ->setParameter('field_id',$field); } else { $qb = $qb->where('0 = 1'); } return $qb; } ))); }; // Populate ddl to show form $country = $this->country; $builder->addEventListener(FormEvents::PRE_SET_DATA,function (FormEvent $event) use ($refreshTopic,$refreshField,$factory,$country) { /** @var Lesson $data */ $data = $event->getData(); $form = $event->getForm(); // Test if null because this event is called 2 times,only the second time with the actual Lesson object (which has null values in the creation case) if($data != null) // In case of creation if($data->getId()==null) { // Creates empty fields $refreshTopic($form,null); $refreshField($form,null); } // In case of edition else { if ($data->getTopic() != null) { $refreshTopic($form,$data->getTopic()->getField()); if ($data->getTopic()->getField() != null) { $refreshField($form,$data->getTopic()->getField()->getClassYear()); } } else { $refreshField($form,null); $refreshTopic($form,null); } } /** @var FormFactory $factory */ $form->add($factory->createNamed('classyear',array( 'class' => 'AAACoreBundle:ClassYear','property' => 'name'.$country,'label' => 'Année','query_builder' => function (EntityRepository $repository) { return $repository->createQueryBuilder('classyear') ->orderBy('classyear.sort'); } ))); }); // Populate ddl when form was posted $builder->addEventListener(FormEvents::PRE_BIND,$refreshField) { $form = $event->getForm(); $data = $event->getData(); if(array_key_exists('classyear',$data)) { $refreshField($form,$data['classyear']); } if(array_key_exists('field',$data)) { $refreshTopic($form,$data['field']); } }); // Select value in ddl when editing $builder->addEventListener(FormEvents::POST_SET_DATA,function (FormEvent $event) use ($refreshTopic) { /** @var Lesson $data */ $data = $event->getData(); $form = $event->getForm(); if (null === $data || null === $data->getId() ) { return; } if ($data->getTopic() != null) { $form->get('field')->setData($data->getTopic()->getField()); if ($data->getTopic()->getField() != null) { $form->get('classyear')->setData($data->getTopic()->getField()->getClassYear()); } } }); } public function getName() { return 'LessonDetailForm'; } /** @param OptionsResolverInterface $resolver */ public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver->setDefaults(array( 'data_class' => 'AAA\CoreBundle\Entity\Lesson' )); } } ?>