在 Symfony2 中嵌入集合类型

Question

尝试嵌入一个集合类型，基本上按照逐步方法here。

我收到以下错误：

The form's view data is expected to be an instance of class
AppBundle\Entity\BenefitGroup, but is an instance of class 
AppBundle\Entity\BenefitItem. You can avoid this error by setting the 
"data_class" option to null or by adding a view transformer that transforms 
an instance of class AppBundle\Entity\BenefitItem to an instance of 
AppBundle\Entity\BenefitGroup.

澄清一下，BenefitItem 是父项，而 BenefitGroup 是子项。

基本上我遇到 this 错误。

我还没有实现（还）允许您动态添加 BenefitGroup 元素的部分，我什至没有尝试保留对象或删除它（所以我还没有实现示例中解释的学说）。

这是我的代码：

BenefitItem 实体：

<?php
// src/AppBundle/Entity/BenefitItem.php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @ORM\Entity(repositoryClass="AppBundle\Entity\BenefitItemRepository")
 * @ORM\Table(name="benefit_items")
 */
class BenefitItem
{
/**
 * @ORM\Column(type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 */
protected $id;

/**
 * @ORM\Column(type="string", length=400)
 */
protected $comment;

public function __construct()
{
    $this->BenefitGroups = new ArrayCollection();
}

public function getBenefitGroups()
{
    return $this->BenefitGroups;
}

/**
 * Get id
 *
 * @return integer 
 */
public function getId()
{
    return $this->id;
}

/**
 * Set comment
 *
 * @param string $comment
 * @return BenefitItem
 */
public function setComment($comment)
{
    $this->comment = $comment;

    return $this;
}

/**
 * Get comment
 *
 * @return string 
 */
public function getComment()
{
    return $this->comment;
}
}

BenefitGroup 实体：

<?php
// src/AppBundle/Entity/BenefitGroup.php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="AppBundle\Entity\BenefitGroupRepository")
 * @ORM\Table(name="benefit_groups")
 */
class BenefitGroup
{
/**
 * @ORM\Column(type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 */
protected $id;

/**
 * @ORM\Column(type="string", length=100)
 */
protected $name;

/**
 * @ORM\ManyToOne(targetEntity="BenefitItem", cascade={"persist"})
 * @ORM\JoinColumn(name="benefitItem_id")
 */
protected $benefitItem;


/**
 * Get id
 *
 * @return integer 
 */
public function getId()
{
    return $this->id;
}

/**
 * Set name
 *
 * @param string $name
 * @return BenefitGroup
 */
public function setName($name)
{
    $this->name = $name;

    return $this;
}

/**
 * Get name
 *
 * @return string 
 */
public function getName()
{
    return $this->name;
}

/**
 * Set benefitItem
 *
 * @param \AppBundle\Entity\BenefitItem $benefitItem
 * @return BenefitGroup
 */
public function setBenefitItem(\AppBundle\Entity\BenefitItem $benefitItem = null)
{
    $this->benefitItem = $benefitItem;

    return $this;
}

/**
 * Get benefitItem
 *
 * @return \AppBundle\Entity\BenefitItem 
 */
public function getBenefitItem()
{
    return $this->benefitItem;
}
}

BenefitItemFormType：

<?php

namespace AppBundle\Form\Type;

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

class BenefitItemFormType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('comment');

    $builder->add('benefitgroups', 'collection', array('type' => new BenefitGroupFormType()));
}

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'data_class' => 'AppBundle\Entity\BenefitGroup',
    ));
}

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

BenefitGroupFormType：

<?php

namespace AppBundle\Form\Type;

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

class BenefitGroupFormType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('name');
}

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'data_class' => 'AppBundle\Entity\BenefitGroup',
    ));
}

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

控制器：

<?php
// AppBundle\Controller\BenefitController.php

namespace AppBundle\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use AppBundle\Entity\BenefitItem;
use AppBundle\Entity\BenefitGroup;
use AppBundle\Form\Type\BenefitItemFormType;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class BenefitController extends Controller
{
/**
 * @Route("/benefit/show", name="benefit_show")
 */
public function showAction(Request $request)
{
    $BI = new BenefitItem();

    $BG1 = new BenefitGroup();
    $BG1->setName = 'Name 1';
    $BI->getBenefitGroups()->add($BG1);
    $BG2 = new BenefitGroup();
    $BG2->setName = 'Name 2';
    $BI->getBenefitGroups()->add($BG2);        

    $form = $this->createForm(new BenefitItemFormType(), $BI);

    $form->handleRequest($request);

    if ($form->isValid()) {
        // ... maybe do some form processing, like saving the Task and Tag objects
    }

    return $this->render('benefit/show.html.twig', array(
        'form' => $form->createView(),
    ));
}
}

有什么想法吗？

Answer 1

你说，你的data_class是BenefitGroup

$resolver->setDefaults(array(
    'data_class' => 'AppBundle\Entity\BenefitGroup',
));

然后你设置一个BenefitItem.

$BI = new BenefitItem();
// ...
$form = $this->createForm(new BenefitItemFormType(), $BI);

那不行。我没有检查你的其余代码，但这也是异常所说的。

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