pedi3/app/Models/Categoria.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Categoria extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'nombre',
    ];

    /**
     * Los productos que pertenecen a la categoría.
     */
    public function productos(): HasMany
    {
        return $this->hasMany(Producto::class);
    }
}