Symfony 4 - 未找到Symfony \ Component \ Form \ AbstractType

Question

尝试通过文档进行文件上传：

https://symfony.com/doc/current/controller/upload_file.html

我已粘贴代码：

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

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

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

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

并得到错误

类Symfony组件表单项目类型php项目htocs docs sympony_4_demo config / services.yaml htdocs adfony_4_demo config / services.yaml“）。

我看到PhpStorm已经发出警告，说明找不到AbstractType。这里有什么问题，怎么解决？

composer.json：

{
    "type": "project",
    "license": "proprietary",
    "require": {
        "php": "^7.1.3",
        "ext-iconv": "*",
        "symfony/console": "^4.0",
        "symfony/flex": "^1.0",
        "symfony/framework-bundle": "^4.0",
        "symfony/lts": "^4@dev",
        "symfony/maker-bundle": "^1.0",
        "symfony/orm-pack": "^1.0",
        "symfony/twig-bundle": "^4.0",
        "symfony/validator": "^4.0",
        "symfony/yaml": "^4.0"
    },
    "require-dev": {
        "symfony/dotenv": "^4.0"
    },
    "config": {
        "preferred-install": {
            "*": "dist"
        },
        "sort-packages": true
    },
    "autoload": {
        "psr-4": {
            "App\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "App\\Tests\\": "tests/"
        }
    },
    "replace": {
        "symfony/polyfill-apcu": "*",
        "symfony/polyfill-php70": "*",
        "symfony/polyfill-php56": "*"
    },
    "scripts": {
        "auto-scripts": {
            "cache:clear": "symfony-cmd",
            "assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd"
        },
        "post-install-cmd": [
            "@auto-scripts"
        ],
        "post-update-cmd": [
            "@auto-scripts"
        ]
    },
    "conflict": {
        "symfony/symfony": "*"
    },
    "extra": {
        "symfony": {
            "id": "01C1AMZG7RRHZQ87EJYRTRWDDA",
            "allow-contrib": false
        }
    }
}

Answer 1

也许缺少对symfony/form的依赖？快速浏览一下你列出的软件包及其依赖项让我怀疑这个......

Answer 2

你运行composer req form了吗？现在Symfony4是最小的包。以前版本中内置的所有东西，现在你必须通过composer安装。你可以通过两种方式做到这一点。首先使用/ package或使用别名。你可以在symfony.sh找到的整个别名列表。

因此，如果您没有安装表单，则可以使用

composer req form

要么

composer req symfony/form