cssd-back/app/Policies/MessagePolicy.php

<?php

namespace App\Policies;

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

class MessagePolicy
{
    public function delete(User $User, Message $Message)
    {
        // if($User->hasRole('Admin') && $Message->users->count() == 0)
            return true;
    }

    public function update(User $User, Message $Message)
    {
        // if($User->hasRole('Admin'))
            return true;
    }

    public function store(User $User)
    {
        // if($User->hasRole('Admin'))
            return true;
    }

}