cssd-back/app/Policies/UserPolicy.php

<?php

namespace App\Policies;

use App\User;
use Doctrine\Tests\Common\Inflector\InflectorTest;

class UserPolicy
{
    public function list(User $User)
    {
        if($User->hasRole('Admin|Supervisor'))
            return true;
    }
    public function delete(User $User, User $Operator)
    {
        if($User->hasRole('Admin') && $Operator->test_results->count() == 0 && $Operator->test_types->count() == 0
          && $Operator->items->count() == 0 && $Operator->packages->count() == 0 && $Operator->labels->count() == 0
          && $Operator->cycles->count() == 0)
            return true;
    }

    public function update(User $User, User $Operator)
    {
        if($User->id == $Operator->id)
            return true;
    }

    public function store(User $User)
    {
        if($User->hasRole('Admin'))
            return true;
    }
    public function changeRole(User $User)
    {
        if($User->hasRole('Admin'))
            return true;
    }
    public function changeStatus(User $User)
    {
        if($User->hasRole('Admin|Supervisor'))
            return true;
    }
}