View file vendor/illuminate/database/Eloquent/Relations/Pivot.php
<?php namespace Illuminate\Database\Eloquent\Relations; use Illuminate\Database\Eloquent\Model; use Illuminate\Database\Eloquent\Relations\Concerns\AsPivot; class Pivot extends Model { use AsPivot; /** * Indicates if the IDs are auto-incrementing. * * @var bool */ public $incrementing = false; /** * The attributes that aren't mass assignable. * * @var array */ protected $guarded = []; }