Symfony 3 Formtype子不会返回相同的块前缀(Symfony 3 Formtype child doesn't return the same block prefix)

 我需要你的帮助。 我有一个实体父母和一个实体孩子的麻烦。 第一个是添加一些新的广告，第二个只是编辑广告而不更改日期。 
 
 AdvertType： 
 
class AdvertType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
                ->add('title', TextType::class)
                ->add('description', TextareaType::class)
                ->add('date', DateTimeType::class)
                ->add('save', SubmitType::class);
        ;

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'LH\PlatformBundle\Entity\Advert'
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'lh_platformbundle_advert';
    }

}
 
 和子女AdvertEditType： 
 
class AdvertEditType extends AbstractType
{ /** * {@inheritdoc}      */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->remove('date');
    }

    public function getParent()
    {
        return AdvertType::class;
    }

    public function getBlockPrefix()
    {
        return parent::getBlockPrefix();
    }
 }

}
 
 函数getBlockPrefix（）在html / twig视图上添加一些selectType id，在AdvertType树枝形式上带有前缀'lh_platformbundle_advert' ，但是当我使用子类型AdvertEditType创建表单时，它具有不同的blockprefix'lh_platformbundle_advert_edit' 。 
 
 我使用了一个jquery函数 ，它不会在编辑表单上工作，导致不同的块前缀。 是否有人知道如何保持父和子之间的相同blockPrefix，以及为什么symfony会改变它？ 非常感谢您的帮助。 

I need your help. I have some trouble with 1 entity parent and one entity child. The first is for add some new advert and the second is just for edit the advert without changing the date.
 
AdvertType:
 
class AdvertType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
                ->add('title', TextType::class)
                ->add('description', TextareaType::class)
                ->add('date', DateTimeType::class)
                ->add('save', SubmitType::class);
        ;

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'LH\PlatformBundle\Entity\Advert'
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'lh_platformbundle_advert';
    }

}
 
and the child AdvertEditType:
 
class AdvertEditType extends AbstractType
{ /** * {@inheritdoc}      */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->remove('date');
    }

    public function getParent()
    {
        return AdvertType::class;
    }

    public function getBlockPrefix()
    {
        return parent::getBlockPrefix();
    }
 }

}
 
The function getBlockPrefix() add on the html/twig view some select id whith the prefix 'lh_platformbundle_advert' on the AdvertType twig form but when i use the child AdvertEditType to create the form, it has a different blockprefix 'lh_platformbundle_advert_edit'.
 
I use a jquery function who doesn't working on the edit form cause to the different block Prefix. Is somebody knows how is it possible to keep the same blockPrefix between the parent and the child, and why symfony change it? Thanks a lot for any help.

原文：https://stackoverflow.com/questions/48939287