在 Symfony 的 EntityType 上设置默认选项 [英] Setting a default choice on Symfony's EntityType

问题描述

如何在 Symfony 的 EntityType 上设置默认选项，以便在绑定的表单对象没有值时使用?

How can I set a default choice on Symfony's EntityType, to use when the bound form object does not have a value?

我已经尝试了以下(在这个答案中建议)，但是dataoption 甚至会覆盖一个绑定值.

I've tried the following (suggested in this answer), but the data option overwrites even a bound value.

class FooEntityType extends AbstractType
{
    public function configureOptions(OptionsResolver $resolver)
    {
        ...
        $resolver->setDefaults([
            'choices' => $fooEntities,
            'class' => 'FooBundle:FooEntity',
            'choice_label' => 'name',
            'expanded' => true,
            'multiple' => false,
            'data' => $fooEntities[0],
        ]);
    }

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

推荐答案

1. 您应该将此代码移至 Type 中的 buildForm(FormBuilderInterface $builder, array $options) 方法

2. 试试这个

1. you should move this code to buildForm(FormBuilderInterface $builder, array $options) method in your Type

2. try this

$entity = $options['data']; // this will be your entity

// form builder
$builder->add('entityProperty', EntityType::class, [
    'choices' => $fooEntities,
    'class' => 'FooBundle:FooEntity',
    'choice_label' => 'name',
    'expanded' => true,
    'multiple' => false,
    'data' => $entity->getEntityProperty() ? $entity->getEntityProperty() : $fooEntities[0]
]);

你也可以通过表单事件来解决这个问题，但不值得

Also you can solve this workaround by form events, but it does not worth it

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