Locker\Repository\Lrs\EloquentRepository::changeRole PHP Method

    public function changeRole($id, $user_id, $role)
    {
        $lrs = $this->show($id, []);
        $lrs->users = array_map(function ($user) use($user_id, $role) {
            $user['role'] = (string) $user['_id'] === $user_id ? $role : $user['role'];
            return $user;
        }, $lrs->users);
        return $lrs->save();
    }