ldc-gen-game-web/app/Models/Codes.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Codes extends Model
{
    protected $fillable = ['code_unique', 'code_used', 'date_creation'];
    public $timestamps = false;

    public function participations() {
        return $this->hasMany('App\Models\Participation', 'code_unique_id');
    }
}