Symfony2 twig在有条件添加的表单字段上抛出渲染错误

Question

如果我尝试在树枝中渲染有条件添加的表单元素，我当前会收到错误。表单元素是通过表单事件侦听器机制添加（或不添加），并且只应在设置了特定表单选项时添加表单元素。

错误

  

传递给Symfony \ Component \ Form \ FormRenderer :: searchAndRenderBlock（）的参数1必须是Symfony \ Component \ Form \ FormView的实例，null给定

表格

<?php
namespace Vendor\ProjectBundle\Form\Type;

// [...]

abstract class AbstractContextualInfoFormType extends AbstractFormType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('user', new UserFormType($this->getTranslator(), $this->getDoctrine()), array('error_bubbling' => true, 'validation_groups' => 'ValidationGroup'));

        $creditcardForm = new CreditcardFormType($this->getTranslator(), $this->getDoctrine());
        $creditcardForm->setProcess($options['process']);
        $creditcardForm->setProvider($options['provider']);
        if (array_key_exists('cvc', $options)) {
            $creditcardForm->setRequireCvc($options['cvc']);
        }

        if (array_key_exists('types', $options)) {
            $creditcardForm->setAllowedCreditcardTypes($options['types']);
        }

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function (FormEvent $event) use ($options) {
                if (!array_key_exists('disable_creditcard', $options) OR (array_key_exists('disable_creditcard', $options) AND $options['disable_creditcard'] === true)) {
                    $creditcardForm = new CreditcardFormType($this->getTranslator(), $this->getDoctrine());
                    $creditcardForm->setProcess($options['process']);
                    $creditcardForm->setProvider($options['provider']);
                    if (array_key_exists('cvc', $options)) {
                        $creditcardForm->setRequireCvc($options['cvc']);
                    }

                    if (array_key_exists('types', $options)) {
                        $creditcardForm->setAllowedCreditcardTypes($options['types']);
                    }

                    $form = $event->getForm();

                    $form->add('creditcard', $creditcardForm, array('error_bubbling' => true));
                }
            }
        );
    }
}

// [...]

正如您所看到的，我只有在未设置选项disable_creditcard时才尝试添加信用卡表单。这一切都正常，直到我尝试浏览我实现表单的页面：

模板

{% if not disable_creditcard %}
<div id="detail_creditcard" class="creditcard">
<legend>{{ 'creditcard.content.title'|trans }}</legend>
<div class="alert alert-info">
    <i class="icon-info-sign"></i>
    Bla bla bla text
</div>
    **{{ form_row(form_data.creditcard.owner) }}**
    {{ form_row(form_data.creditcard.number) }}
    {{ form_row(form_data.creditcard.type) }}
    {{ form_row(form_data.creditcard.validity) }}
    {{ form_rest(form_data.creditcard) }}
</div>
{% endif %}

我也尝试了一个包围条件 - 如果，但这根本不起作用...我认为twig需要“未定义”的信用卡表单元素，但无法找到它。

这样做的正确方法是什么？非常感谢你的任何帮助。 ： - ）

谢谢！

Answer 1

试试这个：

{% if form_data.creditcard is defined %}

... your conditional code here

{% endif %}