我有一个表单PostType，用于创建名为Post的实体，此表单包含实体PhotoType的嵌入子表单Photo。
在编辑Post时，我将PhotoType表单换成ImagePreviewType表单，以显示Photo的小预览，并禁止对Photo进行任何更改}。
这样可行，但问题是，当我预填充PostType表单以创建类似于旧Post的{{1}}时。表单呈现正常，我看到Post中的Photo但是在提交时ImagePreviewType数据为空，我无法再次选择$builder->getData()，因此从回退到ImagePreviewType并期望上传的文件但接收实体并引发错误。
我希望你能理解我的问题，这是我的评论来源，它失败了：
PhotoType：
PostType <?php
namespace Socialised\FbPostingBundle\Form;
use Socialised\FbPostingBundle\Entity\Post;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Validator\Constraints\Url;
use Doctrine\ORM\EntityRepository;
use Socialised\FbPostingBundle\Form\Type\ImagePreviewType;
use Socialised\FbPostingBundle\Form\Type\VideoPreviewType;
class PostType extends AbstractType
{
/**
* @param FormBuilderInterface $builder
* @param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('message', 'textarea', array(
'required' => false,
'label' => 'form.label.message',
'attr' => array('class' => 'variable photo text link video'),
))
->add('link', 'url', array(
'required' => false,
'label' => 'form.helptext.link.url',
'constraints' => new Url(),
'attr' => array('class' => 'variable link'),
)
)
if ($builder->getData()->getPhoto() != null){ // <- This is where it fails
/*
On submit of a new Entity $builder->getData() is empty, even thought data valid is submit.
I'm unable to detect if an image was uploaded or the reference to an `Photo` was send. So the wrong Form is selected.
*/
$builder->add('photo', new ImagePreviewType(), array(
'label' => 'form.label.photo',
'horizontal_input_wrapper_class' => 'variable photo col-lg-8',
'translation_domain' => 'SocialisedFbPostingBundle',
));
}else{
$builder->add('photo', new PhotoType(), array(
'required' => false,
'label' => 'form.label.photo',
'horizontal_input_wrapper_class' => 'variable photo col-lg-8',
'translation_domain' => 'SocialisedFbPostingBundle',
))
}
}
/**
* @param OptionsResolverInterface $resolver
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Socialised\FbPostingBundle\Entity\Post',
'translation_domain' => 'SocialisedFbPostingBundle',
'show_legend' => false,
'attr' => array(
'class' => 'form-horizontal'
),
'securityContext' => false
));
}
/**
* @return string
*/
public function getName()
{
return 'socialised_fbpostingbundle_post';
}
}
：
PhotoType <?php
namespace Socialised\FbPostingBundle\Form;
use Socialised\FbPostingBundle\Entity\Post;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Validator\Constraints\Image;
use Symfony\Component\Validator\Constraints\File;
class PhotoType extends AbstractType
{
/**
* @param FormBuilderInterface $builder
* @param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('file', 'file', array(
'required' => true,
'label' => false,
'constraints' => array(new Image(array(
'minWidth' => 200,
'minHeight' => 200,
)),
new File(array(
'maxSize' => '4096k',
))
),
)
)
;
}
/**
* @param OptionsResolverInterface $resolver
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Socialised\FbPostingBundle\Entity\Photo',
'translation_domain' => 'SocialisedFbPostingBundle',
'show_legend' => false,
));
}
/**
* @return string
*/
public function getName()
{
return 'socialised_fbpostingbundle_photo';
}
}
：
ImagePreviewType解决方案：
将此代码添加到<?php
namespace Socialised\FbPostingBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Socialised\FbPostingBundle\Form\PhotoType;
class ImagePreviewType extends AbstractType
{
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
//'class' => 'SocialisedFbPostingBundle:Photo',
'data_class' => 'Socialised\FbPostingBundle\Entity\Photo',
'property' => 'id',
'by_reference' => false,
));
}
public function getParent()
{
return 'text';
}
public function getName()
{
return 'imagepreview';
}
}
表单似乎可以解决问题。
PostType答案 0 :(得分：1)
您是否尝试过使用POST_SET_DATA表单事件？
http://symfony.com/doc/current/components/form/form_events.html