administraCursos/app/Providers/AuthServiceProvider.php

<?php

namespace App\Providers;

use App\Course;
use App\Policies\CoursePolicy;
use Illuminate\Support\Facades\Gate;
use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider;

class AuthServiceProvider extends ServiceProvider
{
    /**
     * The policy mappings for the application.
     *
     * @var array
     */
    protected $policies = [
        // 'App\Model' => 'App\Policies\ModelPolicy',
        Course::class => CoursePolicy::class,
    ];

    /**
     * Register any authentication / authorization services.
     *
     * @return void
     */
    public function boot()
    {
        $this->registerPolicies();

        Gate::define('add-permission', function ($user, $level, $division_id) {
            $user->loadMissing(['departments', 'faculties.departments']);
            return $user->is_admin
                || ($level === 1) &&
                    ($user->departments->contains($division_id)
                    || $user->faculties->contains(function ($faculty, $key) use ($division_id) {
                        return $faculty->departments->contains($division_id);
                    }))
                || ($level === 2 && $user->faculties->contains($division_id));
        });

        // Gate::define('')
    }
}