Silex

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 Silex (~1.3) 应用程序。我在我的域 classes 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 classes。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 class，State 有一个 Country 属性。

在我的表格中，我声明了一些文本字段，以及一个 Choice 字段，以便能够 select 国家（下面复制表格 class）。

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 填充了来自数据库的数据，但不是选项 country 或 hub（下面复制了控制器 class）。

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：

视图是使用 twig 完成的，'standard' bootstrap 示例可在此处找到：Form Customization, using Bootstrap layout and 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 %}

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;
    }
}

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

假设由于国家和枢纽id没有传输到ChoiceList，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

我设法找到了解决方案（可能不是最好的，但它有效）。

我的理解是：我们将对象作为 choices，将其用作值，然后使用闭包获取 ids 和 labels，而不是进行工作我们自己并向表格提供 'ready-to-use' 数据。

有更简洁的方法吗？

$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'
) );

Answer 3

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

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