Php 文件上传不'；无法创建上载的文件

我目前正在从事一个PHP v5.5.9项目，在该项目中，我使用了一些独立的组件（我不使用完整的堆栈框架），目前如下所示：

psr/log                      1.0.0   Common interface for logging libraries
sonata-project/intl-bundle   2.2.1   Symfony SonataIntlBundle
symfony/debug                v2.4.2  Symfony Debug Component
symfony/dependency-injection v2.4.2  Symfony DependencyInjection Component
symfony/event-dispatcher     v2.4.2  Symfony EventDispatcher Component
symfony/form                 v2.4.2  Symfony Form Component
symfony/http-foundation      v2.4.2  Symfony HttpFoundation Component
symfony/http-kernel          v2.4.2  Symfony HttpKernel Component
symfony/icu                  v1.2.0  Contains an excerpt of the ICU data and classes to load it.
symfony/intl                 v2.4.2  A PHP replacement layer for the C intl extension that includes additional data from the ICU library.
symfony/locale               v2.4.2  Symfony Locale Component
symfony/options-resolver     v2.4.2  Symfony OptionsResolver Component
symfony/property-access      v2.4.2  Symfony PropertyAccess Component
symfony/security-core        v2.4.2  Symfony Security Component - Core Library
symfony/security-csrf        v2.4.2  Symfony Security Component - CSRF Library
symfony/templating           v2.4.2  Symfony Templating Component
symfony/translation          v2.4.2  Symfony Translation Component
symfony/twig-bridge          v2.4.2  Symfony Twig Bridge
symfony/validator            v2.4.2  Symfony Validator Component
twig/extensions              v1.0.1  Common additional features for Twig that do not directly belong in core
twig/twig                    v1.15.1 Twig, the flexible, fast, and secure template language for PHP

我有一个实体类、一个FormType类和一个控制器，我能够通过“细枝”模板视图持久化实体。因此，整个堆栈工作正常

然后，我向我的实体添加了一个属性，以便按照官方文档中的描述添加一个图像文件]。我还使用以下代码扩展了FormType：

$builder->add('pictureFile', 'file', array('label' => 'Image File'));

运行更新的代码（选择图像文件）后，将显示以下错误：

Catchable fatal error: Argument 1 passed to MyEntity::setPictureFile() must be an instance of Symfony\Component\HttpFoundation\File\File, array given, called in [.]\vendor\symfony\property-access\Symfony\Component\PropertyAccess\PropertyAccessor.php on line [.] and defined in MyEntity.php on line [.]

因此，Symfony不会从表单自动创建一个数组，而是将

$\u文件

数据绑定到

数组

。我注意到，其他人也有这个问题：

目前，我正在控制器中使用以下代码，但我希望使用自动绑定功能（因为目前我无法验证实体中上载的文件）

编辑（2014-03-03）：以下是实体的相关代码：

---

我找到了问题中描述的问题的解决方案。因为这似乎是很多人都有的问题，我在这个答案中描述了我的解决方案

在我的研究过程中，我遇到了一个虚拟的数据转换器

在阅读了该页面的内容后，我想出了一个想法，用一个定制的DataTransformer来尝试它，它可以将
数组
转换为
上传文件
的实例

以下是逐步解决方案：

使用以下源代码创建一个名为UploadedFileTransformer的文件：

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
use Symfony\Component\HttpFoundation\File\UploadedFile;


class UploadedFileTransformer implements DataTransformerInterface
{
    /**
     * {@inheritdoc}
     *
     * @param array $data The array to transform to an uploaded file.
     *
     * @return \Symfony\Component\HttpFoundation\File\UploadedFile|null The
     *         uploaded file or `null` if no file has been uploaded.
     */
    public function reverseTransform($data)
    {
        if (!$data) {
            return null;
        }

        $path = $data['tmp_name'];
        $pathinfo = pathinfo($path);
        $basename = $pathinfo['basename'];

        try {
            $uploadedFile = new UploadedFile(
                $path,
                $basename,
                $data['type'],
                $data['size'],
                $data['error']
            );
        } catch (FileNotFoundException $ex) {
            throw new TransformationFailedException($ex->getMessage());
        }

        return $uploadedFile;
    }

    /**
     * {@inheritdoc}
     *
     * @param \Symfony\Component\HttpFoundation\File\UploadedFile|null $file The
     *        uploaded file to transform to an `array`.
     *
     * @return \Symfony\Component\HttpFoundation\File\UploadedFile|null The
     *         argument `$file`.
     */
    public function transform($file)
    {
        return $file;
    }
}


更新FormType以使用
UploadedFileTransformer
作为
文件
类型输入字段（与问题中的代码进行比较）：


从控制器中删除垃圾，在我的示例中是访问
请求
对象以获得上传的文件（与问题中的代码进行比较）


就这样。不要摆弄FormType中的属性，实体中的验证也在工作

我真的不知道，为什么这不是Symfony组件的默认行为？也许我没有在启动代码中注册一些内容？
只需将多部分添加到表单中，它就可以工作了

<form action="#" method="post" enctype="multipart/form-data">

</form>


您的表单是否具有正确的enctype属性？是的，表单按如下方式生成：我有：请参见上文。
<?php
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

class MyType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name', 'text')
            ->add(
                'pictureFile',
                'file',
                array('label' => 'Image File')
            )
            ->add('submit', 'submit', array('label' => 'Save'));
    }

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array('data_class' => __NAMESPACE__ . '\MyEntity'));
    }
}

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
use Symfony\Component\HttpFoundation\File\UploadedFile;


class UploadedFileTransformer implements DataTransformerInterface
{
    /**
     * {@inheritdoc}
     *
     * @param array $data The array to transform to an uploaded file.
     *
     * @return \Symfony\Component\HttpFoundation\File\UploadedFile|null The
     *         uploaded file or `null` if no file has been uploaded.
     */
    public function reverseTransform($data)
    {
        if (!$data) {
            return null;
        }

        $path = $data['tmp_name'];
        $pathinfo = pathinfo($path);
        $basename = $pathinfo['basename'];

        try {
            $uploadedFile = new UploadedFile(
                $path,
                $basename,
                $data['type'],
                $data['size'],
                $data['error']
            );
        } catch (FileNotFoundException $ex) {
            throw new TransformationFailedException($ex->getMessage());
        }

        return $uploadedFile;
    }

    /**
     * {@inheritdoc}
     *
     * @param \Symfony\Component\HttpFoundation\File\UploadedFile|null $file The
     *        uploaded file to transform to an `array`.
     *
     * @return \Symfony\Component\HttpFoundation\File\UploadedFile|null The
     *         argument `$file`.
     */
    public function transform($file)
    {
        return $file;
    }
}

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

class MyType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name', 'text')
            ->add(
                $builder->create(
                    'pictureFile',
                    'file',
                    array('label' => 'Image File')
                )->addModelTransformer(new \UploadedFileTransformer)
            )
            ->add('submit', 'submit', array('label' => 'Save'));
    }

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array('data_class' => __NAMESPACE__ . '\MyEntity'));
    }
}

$formType = new MyType;
$entity = new MyEntity;
$form = $this->formFactory->create($formType, $entity);
$form->handleRequest();

if (true === $form->isSubmitted()) {
    if (true === $form->isValid()) {
        $file = $entity->getPictureFile();

        // Persist entity, upload file to server and redirect.
    }
}

// Load View template.

<form action="#" method="post" enctype="multipart/form-data">

</form>