PHP Doctrine Mapeamento usando o https://www.laraveldoctrine.org/docs/1.3/fluent no curso da Alura https://www.alura.com.br/curso-online-php-doctrine-mapeamento-objeto-relacional

AlunoMapping.php

<?php

namespace Alura\Doctrine\Mapping;

use Alura\Doctrine\Entity\Aluno;
use Alura\Doctrine\Entity\Curso;
use Alura\Doctrine\Entity\Telefone;
use Alura\Doctrine\Repository\AlunoRepository;
use LaravelDoctrine\Fluent\EntityMapping;
use LaravelDoctrine\Fluent\Fluent;

class AlunoMapping extends EntityMapping
{
    public function mapFor(): string
    {
        return Aluno::class;
    }

    public function map(Fluent $builder)
    {
        $builder
            ->entity()
            ->setRepositoryClass(AlunoRepository::class);
        $builder->increments('id');
        $builder->string('nome');
        $builder
            ->oneToMany(Telefone::class, 'telefones')
            ->mappedBy('aluno')
            ->cascadePersist()
            ->cascadeRemove()
            ->fetchEager();
        $builder
            ->manyToMany(Curso::class, 'cursos')
            ->mappedBy('alunos');
    }
}

CursoMapping.php

<?php

namespace Alura\Doctrine\Mapping;

use Alura\Doctrine\Entity\Aluno;
use Alura\Doctrine\Entity\Curso;
use LaravelDoctrine\Fluent\EntityMapping;
use LaravelDoctrine\Fluent\Fluent;

class CursoMapping extends EntityMapping
{
    public function mapFor(): string
    {
        return Curso::class;
    }

    public function map(Fluent $builder)
    {
        $builder->increments('id');
        $builder->string('nome');
        $builder
            ->manyToMany(Aluno::class, 'alunos')
            ->inversedBy('cursos');
    }
}

EntityManagerFactory.php

<?php

namespace Alura\Doctrine\Helper;

use Doctrine\ORM\Configuration;
use Doctrine\ORM\EntityManager;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Tools\Setup;
use LaravelDoctrine\Fluent\FluentDriver;

class EntityManagerFactory
{
    public function getEntityManager(): EntityManagerInterface
    {
        $rootDir = __DIR__ . '/../..';
        $connection = [
            'driver' => 'pdo_sqlite',
            'path' => $rootDir . '/var/data/banco.sqlite',
        ];
        $fluent = new FluentDriver([
            \Alura\Doctrine\Mapping\AlunoMapping::class,
            \Alura\Doctrine\Mapping\CursoMapping::class,
            \Alura\Doctrine\Mapping\TelefoneMapping::class,
        ]);

        $config = new Configuration();
        $config->setProxyDir($rootDir . '/src/Proxy');
        $config->setProxyNamespace('Alura\Doctrine\Proxy');
        $config->setMetadataDriverImpl($fluent);
        
        return EntityManager::create($connection, $config);
    }
}

TelefoneMapping.php

<?php

namespace Alura\Doctrine\Mapping;

use Alura\Doctrine\Entity\Aluno;
use Alura\Doctrine\Entity\Telefone;
use LaravelDoctrine\Fluent\EntityMapping;
use LaravelDoctrine\Fluent\Fluent;

class TelefoneMapping extends EntityMapping
{
    public function mapFor(): string
    {
        return Telefone::class;
    }

    public function map(Fluent $builder)
    {
        $builder->increments('id');
        $builder->string('numero');
        $builder
            ->manyToOne(Aluno::class, 'aluno')
            ->inversedBy('telefones');
    }
}