Mass update positions on a model about rutorika-sortable HOT 3 CLOSED

$posts = Post::sorted()->get()
$position = 1;
foreach ($posts as $post) {
    $post->position = $position;
    $post->save();
    $position++;
}

        $positions = array_flip($request->input('item_ids'));
        foreach($items->all() as $item) {
            $item->update(['position' => $positions[$item->id] + 1]);
        }
        return response()->redirectToRoute($item->getTable().'.index');

foreach ($positions as $id => $position) {
    DB::update('UPDATE items SET position = ? where id = ?', [$position, $id]);
}