Silex-Symfony2:表单自动填充用于文本表单，而不是用于选择 - Silex - Symfony2 : Forms autofilled for text forms, not for choices

首先，祝大家2016年新年快乐！

我面临着一个我无法独自解决的问题。

我正在开发Silex（~1.3）应用程序。我在我的域类上编码了简单的CRUD。我还创建了一些类型表单，以便能够修改我的基本域类。在这种情况下，我必须在Country中管理State的概念。每个都是一个特定的类，State有一个Country属性。

在我的表单中，我声明了一些文本字段和一个Choice字段，以便能够选择国家（表单类复制在下面）。

我的问题是，当我尝试用下面的控制器修改现有的State时，文本字段name、code、unloc填充了数据库中的数据，而不是选项country和hub（控制器类复制在下面）。

请注意，我不是在使用Doctrine，而是一个自制的（非常基本的）DAO。

这是我的代码和一些信息：

视图是使用trick完成的，带有"标准"引导程序示例，可以在这里找到：表单自定义，使用引导程序布局和表单布局：

{% extends 'layout.html.twig' %} {% block title %}{{ title }}{% endblock %}
{% block content %}
    {% if form and is_granted('IS_AUTHENTICATED_FULLY') and is_granted('ROLE_ADMIN')%}
        {% form_theme form 'bootstrap_3_layout.html.twig' %} {{ form_start(form) }}
            <div class="form-group">
                {{ form_errors(form) }}
                {{ form_widget(form) }}
                <input type="submit" class="btn btn-primary" value={% if button is not defined %} "Save"{% else %}"{{ button }}"{% endif %} />
            </div>
        {{ form_end(form) }}
    {% else %}
        <div>
            <p>Ask an admin to add/modify information.</p>
        </div>
    {% endif %}
{% endblock %}

composer.json内容：

{
    "require": {
        "silex/silex": "~1.3",
        "doctrine/dbal": "2.5.*",
        "symfony/security": "2.7.*",
        "twig/twig": "1.21.*",
        "symfony/twig-bridge": "2.7.*",
        "symfony/form": "2.7.*",
        "symfony/translation": "2.7.*",
        "symfony/config": "2.7.*",
        "jasongrimes/silex-simpleuser": "*",
        "twig/extensions": "1.3.*",
        "symfony/validator": "2.*",
        "phpoffice/phpexcel": "1.*"
    },
    "require-dev": {
        "phpunit/phpunit": "*",
        "symfony/browser-kit": "*",
        "symfony/css-selector": "*",
        "silex/web-profiler": "*",
        "symfony/monolog-bridge": "*"
    },
    "autoload":{
        "psr-4":{"Easytrip2''": "src"}
    }
}

表单代码：

<?php
namespace Easytrip2'Form'Type;
use Easytrip2'DAO'CountryDAO;
use Easytrip2'DAO'GeopointDAO;
use Symfony'Component'Form'AbstractType;
use Symfony'Component'Form'Extension'Core'ChoiceList'ChoiceList;
use Symfony'Component'Form'FormBuilderInterface;
use Symfony'Component'OptionsResolver'OptionsResolver;
class StateType extends AbstractType {
    /**
     * @CountryDAO
     * 'Easytrip2'DAO'CountryDAO
     * allow to find the Country for the form.
     */
    private $countryDAO;
    /**
     * @GeopointDAO
     * 'Easytrip2'DAO'GeopointDAO
     * allow to find the Country for the form.
     */
    private $geopointDAO;
    /**
     *
     * {@inheritDoc}
     *
     * @see 'Symfony'Component'Form'AbstractType::buildForm()
     */
    public function buildForm(FormBuilderInterface $builder, array     $options) {
        $builder->add ( 'name', 'text', array (
                'label' => 'State name'
        ) );
        $builder->add ( 'code', 'text', array (
                'label' => 'State code'
        ) );
        $builder->add ( 'unloc', 'text', array (
                'label' => 'State code'
        ) );
        $countries = $this->countryDAO->findAll ();
        $choices = array ();
        $labels = array ();
        foreach ( $countries as $value ) {
            $choices [] = $value;
            $labels [] = $value->getName ();
        }
        $builder->add ( 'country', 'choice', array (
                'choice_list' => new ChoiceList ( $choices, $labels )
        ) );
        $hubs = $this->geopointDAO->findAllHubs ();
        $choices = array ();
        $labels = array ();
        foreach ( $hubs as $value ) {
            $choices [] = $value;
            $labels [] = $value->getName ();
        }
        $builder->add ( 'hub', 'choice', array (
                'choice_list' => new ChoiceList ( $choices, $labels ),
                'required' => false
        ) );
    }
    /**
     *
     * {@inheritDoc}
     *
     * @see 'Symfony'Component'Form'AbstractType::configureOptions()
     */
    public function configureOptions(OptionsResolver $resolver) {
        $resolver->setDefaults ( array (
                'data_class' => 'Easytrip2'Domain'State'
        ) );
    }
    /**
     *
     * {@inheritDoc}
     *
     * @see 'Symfony'Component'Form'FormTypeInterface::getName()
     */
    public function getName() {
        return 'state';
    }
    /**
     * allow use of a CountryDAO
     */
    public function __construct(CountryDAO $countryDAO, GeopointDAO     $geopointDAO) {
        $this->geopointDAO = $geopointDAO;
        $this->countryDAO = $countryDAO;
    }
}

控制器内容：

public function stateUpdateByIdAction($id, Request $request, Application $app) {
        if ($app ['security.authorization_checker']->isGranted ( 'IS_AUTHENTICATED_FULLY' ) and $app ['security.authorization_checker']->isGranted ( 'ROLE_ADMIN' )) {
            $obj = $app ['dao.state']->findById ( $id );
            $form = $app ['form.factory']->create ( new StateType ( $app ['dao.country'], $app ['dao.geopoint'] ), $obj );
            $form->handleRequest ( $request );
            if ($form->isSubmitted () && $form->isValid ()) {
                if ($app ['dao.state']->save ( $obj )) {
                    $app ['session']->getFlashBag ()->add ( 'success', 'The state was succesfully updated.' );
                    return $app->redirect ( $app ['url_generator']->generate ( 'state' ) );
                } else {
                    $app ['session']->getFlashBag ()->add ( 'error', 'Something went wrong...' );
                }
            }
            return $app ['twig']->render ( 'form.html.twig', array (
                    'form' => $form->createView (),
                    'title' => 'Edit states'
            ) );
        } else {
            $app ['session']->getFlashBag ()->add ( 'error', 'Don''t have the rights...' );
            return $app->redirect ( $app ['url_generator']->generate ( 'home' ) );
        }
    }

假设由于国家/地区和集线器id没有传输到ChoiceList ，所以选项中没有填充来自DB的数据

$choices = array();
foreach ($countries as $value) {
    $choices[$value->getId()] = $value->getName();
}
$builder->add('country', 'choice', array(
    'choices' => $choices
));

将此行添加到您的选择选项中：'choices_as_values' => true,

激活新的选择类型API至关重要http://symfony.com/doc/current/reference/forms/types/choice.html#example-使用

我设法找到了一个解决方案（可能不是最好的，但它有效）。

我将其理解为：我们将对象作为choices，将其用作值，然后使用闭包来获得ids和labels，而不是自己完成工作并将"随时可用"的数据提供给表单。

有更干净的方法吗？

$obj = $this->countryDAO->findAll ();
$list = array ();
foreach ( $obj as $value ) {
    $list [$value->getId ()] = $value;
}
$builder->add ( 'country', 'choice', array (
    'choices' => $list,
    'choices_as_values' => true,
    'choice_label' => function ($value) {
        return $value->getName ();
    },
    'choice_value' => function ($value) {
    // you mightwant to check for null here, is your form concern
    // a attribute that can be null, as the closure appear to be called
    // on the attribute, and not only on the $obj contents;
        return $value->getId ();
    },
    'placeholder' => 'Select a country'
) );