symfony上传图片示例代码测试不成功的原因

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想起之前按着symfony文档测试上传文件的示例上传没有成功，在此仅记录下以避免再次踩坑

实体添加文件字段

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// src/Entity/Product.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

class Product
{
    // ...

    /**
     * @ORM\Column(type="string")
     *
     * @Assert\NotBlank(message="Please, upload the product brochure as a PDF file.")
     * @Assert\File(mimeTypes={ "application/pdf" })
     */
    private $brochure;

    public function getBrochure()
    {
        return $this->brochure;
    }

    public function setBrochure($brochure)
    {
        $this->brochure = $brochure;

        return $this;
    }
}

formType添加相应字段

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// src/Form/ProductType.php
namespace App\Form;

use App\Entity\Product;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class ProductType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            // ...
            ->add('brochure', FileType::class, ['label' => 'Brochure (PDF file)'])
            // ...
        ;
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Product::class,
        ]);
    }
}

控制器提交代码

此处将$file = $product->getBrochure();(标记1) 更改为 $file = $form->get('brochure')->getData();(标记2)。
因为 orm获取的brochure是对应该字段的类型 字符串
而 form->get()->getData获取的才是实际的UploadedFile对象

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use App\Form\ProductType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\File\Exception\FileException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class ProductController extends AbstractController
{
    /**
     * @Route("/product/new", name="app_product_new")
     */
    public function new(Request $request)
    {
        $product = new Product();
        $form = $this->createForm(ProductType::class, $product);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // $file stores the uploaded PDF file
            /** @var Symfony\Component\HttpFoundation\File\UploadedFile $file */
            $file = $product->getBrochure();

            $fileName = $this->generateUniqueFileName().'.'.$file->guessExtension();

            // Move the file to the directory where brochures are stored
            try {
                $file->move(
                    $this->getParameter('brochures_directory'),
                    $fileName
                );
            } catch (FileException $e) {
                // ... handle exception if something happens during file upload
            }

            // updates the 'brochure' property to store the PDF file name
            // instead of its contents
            $product->setBrochure($fileName);

            // ... persist the $product variable or any other work

            return $this->redirect($this->generateUrl('app_product_list'));
        }

        return $this->render('product/new.html.twig', [
            'form' => $form->createView(),
        ]);
    }

    /**
     * @return string
     */
    private function generateUniqueFileName()
    {
        // md5() reduces the similarity of the file names generated by
        // uniqid(), which is based on timestamps
        return md5(uniqid());
    }
}
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