Symfony 3：提交表单后设置值

Question

我有一个form collection并想field2在提交表单后设置，具体取决于field1. field2在表单中不可编辑，但需要。

我尝试了每个FormEvent (FormEvents::)但收到错误：

SQLSTATE[23000]：违反完整性约束：1048 列“field2”不能为空

// AppBundle/Form/MyFormType.php

// ...
$builder->addEventListener(FormEvents::POST_SUBMIT, function(FormEvent $even) {
    $data = $event->getData();
    $form = $event->getForm();

    if (isset($data['field1'])) { // isset
        $field2 = $this->container->get('repository')->find($data['field1'])->getValue(); // service works

        $data['field2'] = $field2; // !!! doesn't work !!!              
        $data->setField2($field2); // !!! doesn't work !!!    
    }
});

我究竟做错了什么？提前致谢！

Answer 1

试试这个

use Symfony\Component\Form\FormEvents;

$builder->addEventListener(FormEvents::PRE_SUBMIT, function(FormEvent $event) {
    $data = $event->getData();
    $form = $event->getForm();

    if (isset($data['field1'])) {
        $field2 = $this->container->get('repository')->find($data['field1'])->getValue();

        $data['field2'] = $field2;              
        $event->setData($data); 
    }
});