Symfony 4 - 自动加载器预期的类 […] 将在文件中定义

Question

我正在尝试将在 Symfony 3.* 上构建的旧 Bundle 添加到 Symfony 4，但我收到此错误：

自动加载器预期的类 "App\SBC\TiersBundle\Controller\ChantierController" 定义在 文件 “/Applications/MAMP/htdocs/Projects/HelloSymfony4/vendor/composer/../../src/SBC/TiersBundle/Controller/ChantierController.php”。 找到文件但类不在其中，类名或 命名空间可能有错字 /Applications/MAMP/htdocs/Projects/HelloSymfony4/config/services.yaml （在资源中加载 “/Applications/MAMP/htdocs/Projects/HelloSymfony4/config/services.yaml”）。

框架似乎无法识别包的命名空间，所以我执行了以下步骤：
在config/bundle.php 我添加了第三行：

return [
    Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
    Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
    \SBC\TiersBundle\TiersBundle::class => ['all' => true], // this one
    Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true],
];

在composer.json 中，我在autoload 部分添加了第一行：

"autoload": {
        "psr-4": {
            "SBC\\": "src/SBC/",
            "App\\": "src/"

        }
    },

因为我的Bundle的命名空间以SBC\开头，而我已经在控制台启动了composer dump-autoload。

<?php

namespace SBC\TiersBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;

class TiersBundle extends Bundle
{
}

ChantierController.php：

namespace SBC\TiersBundle\Controller;

use SBC\TiersBundle\Entity\Chantier;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;


class ChantierController extends Controller
{
...
}

这是我在 /src 下的 Bundle:

不幸的是仍然面临同样的错误，我该如何解决它并提前感谢。

更新：config/services.yaml:

# Put parameters here that don't need to change on each machine where the app is deployed
# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
parameters:

services:
    # default configuration for services in *this* file
    _defaults:
        autowire: true      # Automatically injects dependencies in your services.
        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
        public: false       # Allows optimizing the container by removing unused services; this also means
                            # fetching services directly from the container via $container->get() won't work.
                            # The best practice is to be explicit about your dependencies anyway.

    # makes classes in src/ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    SBC\:
        resource: '../src/SBC/*'
        exclude: '../src/SBC/TiersBundle/{Entity,Migrations,Tests}'

    SBC\TiersBundle\Controller\:
        resource: '../src/SBC/TiersBundle/Controller'
        tags: ['controller.service_arguments']

    App\:
        resource: '../src/*'
        exclude: '../src/{Entity,Migrations,Tests}'

    # controllers are imported separately to make sure services can be injected
    # as action arguments even if you don't extend any base controller class
    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']

    # add more service definitions when explicit configuration is needed
    # please note that last definitions always *replace* previous ones

Answer 1

这个问题很可能是由 Symfony 配置和命名空间冲突引起的。首先你需要调整你的config/services.yaml：

SBC\:
    resource: '../src/SBC/*'
    exclude: '../src/SBC/TiersBundle/{Entity,Migrations,Tests,Kernel.php}'

SBC\TiersBundle\Controller\:
    resource: '../src/SBC/TiersBundle/Controller'
    tags: ['controller.service_arguments']

App\:
    resource: '../src/*'
    exclude: '../src/{SBC,Entity,Migrations,Tests,Kernel.php}'

这样，您将为命名空间定义默认值，并防止默认命名空间App 在生成自动加载类时包含您的目录。注意如果使用注解路由，还需要调整config/routes/annotations.yaml：

sbc_controllers:
    resource: ../../src/SBC/TiersBundle/Controller/
    type: annotation

所以路线是正确生成的。执行这些步骤后，再次运行 composer dump-autoload 并清除 Symfony 的缓存。

如果您以后遇到其他问题，这可能会有所帮助：https://github.com/symfony/symfony/blob/master/UPGRADE-4.0.md