1

我目前正在开发一个 PHP v5.5.9 项目，其中我使用了一些独立组件（我不使用全栈框架），目前如下：

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Entity类、一个FormType类和一个Controller，我可以通过“Twig”模板View来持久化Entity。所以整个堆栈工作正常。

然后我向我的EntityFile添加了一个属性，以便按照官方文档中的描述添加图像文件] 1。我还使用以下代码扩展了我的FormType ：

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

运行更新后的代码（选择图像文件）后，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不会自动从表单创建一个UploadedFile，而是将数据绑定$_FILE到一个array. 我注意到，其他人也有这个问题：

目前我在Controller中使用以下代码，但我想使用自动绑定功能（因为目前我无法在Entity中验证上传的文件）。

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

if (true === $form->isSubmitted()) {
    if (true === $form->isValid()) {
        // TODO Replace ugly workaround to partially solve the problem of the file upload.
        $request = Request::createFromGlobals();
        $file = $request->files->get('myentity')['pictureFile'];

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

// Load View template.

编辑（2014-03-03）：这是实体的相关代码：

<?php
use Symfony\Component\HttpFoundation\File\File;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class MyEntity
{
    private $id;
    private $name;
    private $picture;

    public function getId()
    {
        return $this->id;
    }

    public function setId($id)
    {
        $this->id = $id;
    }

    public function getName()
    {
        return $this->name;
    }

    public function setName($name)
    {
        $this->name = $name;
    }

    public function getPictureFile()
    {
        return $this->pictureFile;
    }

    public function setPictureFile(File $pictureFile = null)
    {
        $this->pictureFile = $pictureFile;
    }

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint(
            'name',
            new Assert\NotBlank
        );
        $metadata->addPropertyConstraint(
            'name',
            new Assert\Type('string'));
        $metadata->addPropertyConstraint(
            'pictureFile',
            new Assert\Image(
                array(
                    'maxSize' => '2048k',
                    'minWidth' => 640,
                    'maxWidth' => 4096,
                    'minHeight' => 480,
                    'maxHeight' => 4096
                )
            )
      );
    }
}

以及FormType的源代码：

<?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'));
    }
}

有什么建议如何完成这项工作吗？

编辑（2014-03-07）：简化源代码以准备我的回答。

4

2 回答 2

1

I've found a solution for the problem described in the question. Since this seems to be a problem many people have, I describe my solution in this answer.

During my research I've come across a issue on GitHub, which contains a dummy DataTransformer.

After reading the content of that page, I came up with the idea to try it with a custom DataTransformer which converts the array into an instance of UploadedFile.

Here is the step-by-step solution:

  1. Create a DataTransformer named UploadedFileTransformer with the following source code:

    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;
    }
}

  2. Update the FormType to use the UploadedFileTransformer for a file type input field (compare with the code in the question):

    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'));
    }
}

  3. Remove crap from the Controller, in my example the access to the Request object to obtain the uploaded file (compare with the code in the question).

    $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.

And that's it. No fiddling with attributes in the FormType and the validation in the Entity is also working.

I really don't know, why this isn't the default behavior of the Symfony components? Maybe I missed to register something in my startup code?

于 2014-03-07T08:24:40.640 回答
0

只需将多部分添加到表单中，它应该可以工作

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

</form>
于 2014-07-31T14:29:45.353 回答