我正在尝试在Symfony 2中创建一个新的表单类型。它基于实体类型,前端使用select2,我需要让用户能够选择现有实体或创建新实体。
我的想法是发送实体的ID,并让默认实体类型将其转换为现有实体,如果用户输入新值,则发送类似“_new:输入文本”的内容。然后,我的自定义模型转换器应将此字符串转换为新的表单实体,它应该类似于以下内容:
感谢您的建议。
我的想法是发送实体的ID,并让默认实体类型将其转换为现有实体,如果用户输入新值,则发送类似“_new:输入文本”的内容。然后,我的自定义模型转换器应将此字符串转换为新的表单实体,它应该类似于以下内容:
<?php
namespace Acme\MainBundle\Form\DataTransformer;
use Symfony\Component\Form\DataTransformerInterface;
class EmptyEntityTransformer
implements DataTransformerInterface
{
private $entityName;
public function __construct($entityName)
{
$this->entityName = $entityName;
}
public function transform($val)
{
return $val;
}
public function reverseTransform($val)
{
$ret = $val;
if (substr($val, 0, 5) == '_new:') {
$param = substr($val, 5);
$ret = new $this->entityName($param);
}
return $ret;
}
}
很遗憾,转换器只有在选择现有实体时才会被调用。当我输入一个新值时,字符串被发送到请求中,但是转换器的reverseTransform方法根本没有被调用。
我是Symfony的新手,所以我甚至不知道这种方法是否正确。你有什么想法如何解决这个问题吗?
编辑:
<?php
namespace Acme\MainBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\FormInterface;
use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Acme\MainBundle\Form\DataTransformer\EmptyEntityTransformer;
use Symfony\Component\PropertyAccess\PropertyAccess;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
class Select2EntityType
extends AbstractType
{
protected $router;
public function __construct(Router $router)
{
$this->router = $router;
}
/**
* {@inheritdoc}
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
parent::setDefaultOptions($resolver);
$resolver->setDefaults(array(
'placeholder' => null,
'path' => false,
'pathParams' => null,
'allowNew' => false,
'newClass' => false,
));
}
public function getParent()
{
return 'entity';
}
public function getName()
{
return 's2_entity';
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
if ($options['newClass']) {
$transformer = new EmptyEntityTransformer($options['newClass']);
$builder->addModelTransformer($transformer);
}
}
public function buildView(FormView $view, FormInterface $form, array $options)
{
$field = $view->vars['name'];
$parentData = $form->getParent()->getData();
$opts = array();
if (null !== $parentData) {
$accessor = PropertyAccess::createPropertyAccessor();
$val = $accessor->getValue($parentData, $field);
if (is_object($val)) {
$getter = 'get' . ucfirst($options['property']);
$opts['selectedLabel'] = $val->$getter();
}
elseif ($choices = $options['choices']) {
if (is_array($choices) && array_key_exists($val, $choices)) {
$opts['selectedLabel'] = $choices[$val];
}
}
}
$jsOpts = array('placeholder');
foreach ($jsOpts as $jsOpt) {
if (!empty($options[$jsOpt])) {
$opts[$jsOpt] = $options[$jsOpt];
}
}
$view->vars['allowNew'] = !empty($options['allowNew']);
$opts['allowClear'] = !$options['required'];
if ($options['path']) {
$ajax = array();
if (!$options['path']) {
throw new \RuntimeException('You must define path option to use ajax');
}
$ajax['url'] = $this->router->generate($options['path'], array_merge($options['pathParams'], array(
'fieldName' => $options['property'],
)));
$ajax['quietMillis'] = 250;
$opts['ajax'] = $ajax;
}
$view->vars['options'] = $opts;
}
}
然后我创建了这个表单类型:
class EditType
extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('masterProject', 's2_entity', array(
'label' => 'Label',
'class' => 'MyBundle:MyEntity',
'property' => 'name',
'path' => 'my_route',
'pathParams' => array('entityName' => 'name'),
'allowNew' => true,
'newClass' => '\\...\\MyEntity',
))
感谢您的建议。