symfony - 当使用 symfony 2's form type "集合时，如何验证至少已提交一份表单？

Question

我用了this tutorial嵌入表单集合。如何添加验证以确保表单至少与一张表单一起提交？

Answer 1

Symfony 现在有一个 Count 约束，可以与集合类型一起使用来设置最小项目数:

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;

$formBuilder->add('example', CollectionType::class, [
  // other options...
  'constraints' => [
    new Assert\Count([
      'min' => 1,
      'minMessage' => 'Must have at least one value',
      // also has max and maxMessage just like the Length constraint
    ]),
  ],
]);