Silex - Symfony2：为文本表单自动填充的表单，而不是用于选择

Question

首先，祝大家2016年新年快乐！

我遇到了一个我自己无法解决的问题。

我正在开发一个 Silex (~1.3) 应用程序。我在我的域类上编写了简单的 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（下面复制了表单类）。

我的问题是，当我尝试使用以下控制器修改现有 State 时，文本字段 name、code、unloc 填充了数据库中的数据，而不是选项 @ 987654335@也不是hub（控制器类复制如下）。

请注意，我使用的不是 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：

1. 视图是使用 twig 完成的，“标准”引导示例可以在这里找到：Form Customization，使用 Bootstrap layout 和 Form layout：

   {% 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 %}
   

2. 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"}
       }
   }
   

3. 表格代码：

   <?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;
       }
   }
   

4. 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' ) );
           }
       }
   

Answer 1

假设由于国家和中心 id 没有传输到 ChoiceList 中，所以选择没有填充来自 DB 的数据

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

Answer 2

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

必须激活新的选择类型 API http://symfony.com/doc/current/reference/forms/types/choice.html#example-usage

Answer 3

我设法找到了一个解决方案（可能不是最好的，但它确实有效）。

我的理解是：我们将对象作为choices，将其用作值，然后使用闭包来获取ids 和labels，而不是自己完成工作并给出'ready-to-在表单中使用'数据。

有没有更清洁的方法？

$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'
) );