code: public function buildView(FormView $view, FormInterface $form, array $options)
      {
          $view->vars['multiple'] = $options['multiple'];
          $view->vars['allowed_filetypes'] = $options['allowed_filetypes'];
  
          $mediaEntity = $this->manager->getRepository('MMMediaBundle:Media')->find((int) $view->vars['value']);
          $view->vars['value_media_json'] = $this->getJsonFormatedMedia($mediaEntity);
          // TODO: implement MediaType Configuration
      }
docs: {@inheritdoc}