/var/www/html/back/app/Models/Role.php
<?php

declare(strict_types=1);

namespace App\Models;

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

class Role extends Model
{
    use HasFactory;

    protected $fillable = [
        'user_id',
        'role',
        'model_id',
        'permissions'
    ];

    protected $casts = [
        'permissions' => 'json',
        'is_blocked' => 'boolean',
    ];

    public function model(): BelongsTo
    {
        return $this->belongsTo(System::class);
    }
}