Symfony2异常时试图嵌入一个表单集合 [英] Symfony2 exception when trying to embed a collection of forms

问题描述

此问题的延续：

我'试图嵌入正式文档 here 。不幸的是，我收到以下异常：

I'm trying to embed a collection of forms as described in the official docs here. Unfortunately, I'm getting the following exception:

表单的视图数据预计将是Acme\SiteBundle \\ Entity\BlogPost，但是是（n）数组。您可以通过将data_class选项设置为null或通过添加将（n）数组转换为Acme\SiteBundle\Entity\BlogPost的实例的视图变换器来避免此错误。

The form's view data is expected to be an instance of class Acme\SiteBundle\Entity\BlogPost, but is a(n) array. You can avoid this error by setting the "data_class" option to null or by adding a view transformer that transforms a(n) array to an instance of Acme\SiteBundle\Entity\BlogPost.

这是奇怪的，因为我相信我遵循官方文档到't'：

Which is odd, as I believe I followed the official docs to a 't':

BlogPostType：

BlogPostType:

class BlogPostType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // static text fields/attrs (title, body, etc)
        $builder->add('comments', 'collection', array('type' => new CommentType()));
    }

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array('data_class' => 'Acme\SiteBundle\Entity\BlogPost'));
    }
}

CommentType：

CommentType:

class CommentType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('commentId', 'hidden');
        $builder->add('commentBody','text',array('label' => 'Comment:','attr'=>array('size'=>80,'class'=>'form-item-input form-type-texfield')));
    }

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array('data_class' => 'Acme\SiteBundle\Entity\Comment'));
    }
}

BlogPost中定义的关系：

Relationship as defined in BlogPost:

/**
 * @var \Acme\SiteBundle\Entity\Comment.php
 *
 * @ORM\OneToMany(targetEntity="Comment", mappedBy="blogpost",
    cascade={"all"},orphanRemoval=true)
 * @ORM\OrderBy({"commentId" = "ASC"})
 */
private $comments;

在评论中：

/**
 * @var BlogPost
 *
 * @ORM\ManyToOne(targetEntity="BlogPost", inversedBy="comments")
 * @ORM\JoinColumns({
 *   @ORM\JoinColumn(name="blog_id", referencedColumnName="id")
 * })
 */
private $blogPost;

所以，我不知道我错了什么。任何想法？

So, I'm not sure where I've gone wrong. Any ideas?

推荐答案

事实证明，我是一个白痴（大惊喜），并将表单生成器传递给数组。以前工作的旧代码现在已经打破了。 Whee！

Turns out I was an idiot (big surprise there) and was passing the form builder an array. Old code that used to work was breaking it now. Whee!

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