尝试从命名空间“App\DataFixtures”加载类“BaseFixture”。您是不是忘记了另一个名称空间的“使用”语句？

Posted 2023-02-16

【中文标题】尝试从命名空间“App\\DataFixtures”加载类“BaseFixture”。您是不是忘记了另一个名称空间的“使用”语句？

【英文标题】：Attempted to load class "BaseFixture" from namespace "App\DataFixtures". Did you forget a "use" statement for another namespace?尝试从命名空间“App\DataFixtures”加载类“BaseFixture”。您是否忘记了另一个名称空间的“使用”语句？

【发布时间】：2020-05-24 10:10:15

【问题描述】：

我正在尝试使用命令：

php bin/console do:fixtures:load

在我的项目中添加一些虚拟数据。

当我调用命令时，我收到以下错误。

致命错误：未捕获 Symfony\Component\Debug\Exception\ClassNotFoundException：试图 从命名空间“App\DataFixtures”加载类“BaseFixture”。你是否 忘记另一个命名空间的“使用”语句？在 K:\programming\development\testProject\app\src\DataFixtures\UserFixtures.php 在第 9 行

Symfony\Component\Debug\Exception\ClassNotFoundException: 试图 从命名空间“App\DataFixtures”加载类“BaseFixture”。你是否 忘记另一个命名空间的“使用”语句？在 K:\programming\development\testProject\app\src\DataFixtures\UserFixtures.php 在第 9 行

调用堆栈： 0.1044 2464280 1. Symfony\Component\Debug\ErrorHandler->handleException() K:\programming\development\testProject\app\vendor\symfony\debug\ErrorHandler.php:0

我似乎无法找出问题所在。

这是我的BaseFixtures课堂

  <?php

namespace App\DataFixtures;

use Doctrine\Bundle\FixturesBundle\Fixture;
use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Migrations\Version\Factory;
use Symfony\Bundle\MakerBundle\Generator;

abstract class BaseFixture extends Fixture

    /** @var ObjectManager */
    private $manager;

    /** @var Generator */
    protected $faker;

    private $referencesIndex = [];

    abstract protected function loadData(ObjectManager $manager);

    public function load(ObjectManager $manager)
    
        $this->manager = $manager;
        $this->faker = Factory::create();

        $this->loadData($manager);
    

    /**
     * Create many objects at once:
     *
     *      $this->createMany(10, function(int $i) 
     *          $user = new User();
     *          $user->setFirstName('Ryan');
     *
     *           return $user;
     *      );
     *
     * @param int      $count
     * @param string   $groupName Tag these created objects with this group name,
     *                            and use this later with getRandomReference(s)
     *                            to fetch only from this specific group.
     * @param callable $factory
     */
    protected function createMany(int $count, string $groupName, callable $factory)
    
        for ($i = 0; $i < $count; $i++) 
            $entity = $factory($i);

            if (null === $entity) 
                throw new \LogicException('Did you forget to return the entity object from your callback to BaseFixture::createMany()?');
            

            $this->manager->persist($entity);

            // store for usage later as groupName_#COUNT#
            $this->addReference(sprintf('%s_%d', $groupName, $i), $entity);
        
    

    protected function getRandomReference(string $groupName) 
        if (!isset($this->referencesIndex[$groupName])) 
            $this->referencesIndex[$groupName] = [];

            foreach ($this->referenceRepository->getReferences() as $key => $ref) 
                if (strpos($key, $groupName.'_') === 0) 
                    $this->referencesIndex[$groupName][] = $key;
                
            
        

        if (empty($this->referencesIndex[$groupName])) 
            throw new \InvalidArgumentException(sprintf('Did not find any references saved with the group name "%s"', $groupName));
        

        $randomReferenceKey = $this->faker->randomElement($this->referencesIndex[$groupName]);

        return $this->getReference($randomReferenceKey);
    

    protected function getRandomReferences(string $className, int $count)
    
        $references = [];
        while (count($references) < $count) 
            $references[] = $this->getRandomReference($className);
        

        return $references;
    

这是我扩展基类的用户类。

    <?php

namespace App\DataFixtures;

use App\Entity\User;
use App\DataFixtures\BaseFixture;
use Doctrine\Common\Persistence\ObjectManager;

class UserFixtures extends BaseFixture

    protected function loadData(ObjectManager $manager)
    
        $this->createMany(10, 'main_users', function ($i)
           $user = new User();
           $user->setEmail(sprintf('[e-mail]', $i));
           $user->setFirstName($this->faker->firstName);

           return $user;
        );

        // $product = new Product();
        // $manager->persist($product);

        $manager->flush();
    

我已经盯着这个看了很长时间，我似乎无法弄清楚问题出在哪里。

【问题讨论】：

您确定文件名称正确吗？

【参考方案1】：

当然，此时如果尝试加载用户设备，Symfony 控制台会抛出错误，因为 App\Entity\User 类还不存在。

https://programarivm.com/why-you-shouldnt-use-real-data-for-development-purposes

【讨论】：

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