Question

我试图通过为其提供参数来让孩子形成更具活力（除了已经通过使其成为服务而具有高度可重用性）。

但是，我无法为子表单使用的选择类提供参数。

TL; DR：表单StateListType继承choice父级。是否可以更改/覆盖默认的＆＃39; choice_list＆＃39;来自StateListType内的buildForm方法？

以下代码中的注释解释了我想要做的事情。

<?php

namespace Acme\DemoBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

class PersonFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('State', 'statelist'),//statelist is a form service.
            ->add('HomeState', 'statelist')//use form service here too
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Acme\DemoBundle\Entity\Person'
        ));
    }

    public function getName()
    {
        return 'person';
    }
}

以下代码是服务容器负责为其注入适当依赖关系的表单。

<?php

namespace Acme\DemoBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;

class StateListType extends AbstractType
{
    protected $ChoiceList;

    public function __construct(ChoiceListInterface $Choices)
    {
        //If I'm right I can't use another parameter
        //to call from the parent form since it's already a service?
        $this->ChoiceList = $Choices;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        //Don't usually need this method at all.
        //However if I need to provide arguments
        //I can set 'custom_argument'
        //in the setDefaultOptions method below.

        //Then I could use $options['custom_argument']
        //from the parent form to provide arguments to
        //$this->ChoiceList->doSomething($options['custom_argument')
        //and then replacing the default 'choice_list' with this?
        //Just not sure how or if even possible to do it from here.
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver
            ->setDefaults(
                array(
                    //Could use $arg this by getting options from the constructor.
                    //But since it's a service I can't supply dynamic arguments.
                    'choice_list' => $this->ChoiceList->doSomething($arg),//Returns itself after doing something.
                    'empty_value' => 'select a state',
                    'custom_argument' => null
                )
            );

    }

    public function getParent()
    {
        return 'choice';
    }

    public function getName()
    {
        return 'statelist';
    }
}

根据评论中的要求提供额外信息：

服务：

StateListChoice:
    class: Acme\DemoBundle\Form\Extension\StateListChoices

StateListType:
    class: Acme\DemoBundle\Form\StateListType
    arguments: ["@StateListChoices"]
    tags:
            {name: form.type, alias: statelist}

自定义选择类：

StateListChoices.php

class StateListChoices extends LazyChoiceList implements ChoiceListInterface
{
    ...
    public function doSomething($argument)
    {
         //Does something with argument
         return $this; //Returns ChoiceListInterface object.
    }
    ...
}

Answer 1

如果您buildForm() StateListType我不知道为什么不直接在PersonType中构建表单？

您还可以将PersonType定义为服务：

PersonType:
    class: Acme\DemoBundle\Form\PersonType
    arguments: ["@StateListChoices"]
    tags:
            {name: form.type, alias: person}

然后直接在那里使用选择服务：

use Acme\DemoBundle\Form\Extension\StateListChoices


class PersonType extends AbstractType
{
    public function __construct(ChoiceListInterface $choicesList)
    {
        $this->choicesList = $choicesList;
    }

    private function getChoices($argument = null)
    {
        return $this->choicesList->doSomething($argument);
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
          $builder
            ->add('State', 'choice', array(
                'choice_list' => $this->getChoices($options['custom_argument']),
            ))
            ->add('HomeState', 'statelist', array(
                'choice_list' =>  $this->getChoices();
            ));
    }

从父表单提供服务的子表单的参数？

1 个答案: