administraCursos/app/Policies/ProfessorPolicy.php

<?php

namespace App\Policies;

use App\User;
use App\Professor;
use Illuminate\Auth\Access\HandlesAuthorization;

class ProfessorPolicy
{
    use HandlesAuthorization;

    /**
     * Determine whether the user can view any professors.
     *
     * @param  \App\User  $user
     * @return mixed
     */
    public function viewAny(User $user)
    {
        return true;
    }

    /**
     * Determine whether the user can update the professor.
     *
     * @param  \App\User  $user
     * @param  \App\Professor  $professor
     * @return mixed
     */
    public function update(User $user, Professor $professor)
    {
        return $user->departments->where('id', '=', $professor->dept_id)->isNotEmpty()
            || $user->faculties->where('id', '=', $professor->faculty->id)->isNotEmpty();
    }

    /**
     * Determine whether the user can delete the professor.
     *
     * @param  \App\User  $user
     * @param  \App\Professor  $professor
     * @return mixed
     */
    public function delete(User $user, Professor $professor)
    {
        return $user->departments->where('id', '=', $professor->dept_id)->isNotEmpty()
            || $user->faculties->where('id', '=', $professor->faculty->id)->isNotEmpty();
    }

}