/**
* remove song from playlist
**/
public function untag($parameter)
{
$song_id = $parameter[0];
$playlist_id = $parameter[1];
$model = new \Models\Playlist();
$item = $model->find($id);
$delete = $model->delete(array('playlist_album_id' => $playlist_id, 'playlist_song_id' => $song_id));
if ($delete > 0) {
Session::set('success', 'record deleted!');
} else {
Session::set('error', 'operation fails!');
}
Url::previous();
}