使用Symfony 4 Form组件显示JSON数据

Question

我一直在尝试显示带有数据json的表单。我不明白我需要做什么，因为这个表单有几个带有TextType的输入字段？一个输入字段中有一个值json。

我知道如何在无组件形式的情况下查看json数组，但我想以Symfony 4组件形式查看json。

这是json数组

[{"name":"PHP","image":"php.png"},{"name":"java","image":"java.png"},{"name":"postgresql","image":"postgresql.png"},{"name":"JS","image":"js.png"}]

这是我的代码：

Classs ProjectsController

class ProjectsController extends BaseAdminController {

  public function createEntityFormBuilder($entity, $view)
  {
    $formBuilder = parent::createEntityFormBuilder($entity, $view);

    $formBuilder
        ->add('title')
        ->add('description', TextareaType::class)
        ->add('technology', ProjectTechnologyType::class)
        ->add('type', ProjectType::class)
        ->add('url');

    return $formBuilder;
  }
}

Class ProjectTechnologyType

class ProjectTechnologyType extends AbstractType {

  public function buildForm(FormBuilderInterface $builder, array $options)
  {
    $builder
        ->add('image', ProjectJsonType::class);

    $builder->get('image')
        ->addModelTransformer(new CallbackTransformer(
            function ($technologyAsArray) {
                return json_encode($technologyAsArray);
            },
            function ($technologyAsJson) {
                return json_decode($technologyAsJson);
            }
        ));
  }

  public function configureOptions(OptionsResolver $resolver)
  {
    $resolver->setDefaults(array(
        'data_class' => ProjectTechnology::class
    ));
  }
}

Class ProjectJsonType

class ProjectJsonType extends AbstractType{

  public function configureOptions(OptionsResolver $resolver)
  {
    $resolver->setDefaults([]);
  }

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

树枝

{% block main %}
{% block entity_form %}
    {{ form_row(form.title) }}
    {{ form_row(form.description) }}
    {{ form_row(form.type) }}
    {{ form_row(form.technology) }}
    {{ form_row(form.url) }}
{% endblock entity_form %}
{% endblock %}