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// src/Entity/Product.php
<?php

namespace App\Entity;

use App\Repository\ProductRepository;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use DOctrine\DBAL\Types\Types;

#[ORM\Entity(repositoryClass: ProductRepository::class)]
#[ORM\Table(name: 'products')]
class Product
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

    #[ORM\Column(length: 255, type: Types::TEXT)]
    #[Assert\NotBlank]
    #[Assert\Length(min: 3, max: 255)]
    private ?string $name = null;

    #[ORM\Column(type: Types::INTEGER]
    #[Assert\NotNull]
    #[Assert\PositiveOrZero]
    private ?int $price = null;

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): static
    {
        $this->name = $name;
        return $this;
    }

    // ... more getters and setters ...
}

// src/Repository/ProductRepository.php
// src/Form/ProductType.php
// src/Controller/ProductController.php
// ... and many more files to write manually ...