....
public function generate(Request $request){
        $url = $request->url;

        $data = new Links;
        $data->kode = rand();
        $data->href = $url;
        $data->save();

        $new_url = url('/').'/'.$data->kode;

        \Session::flash('url',$new_url);

        return redirect()->back();
    }
....