Call to undefined method appends()

I created a filter for db table, but filtration just work for first page

I try this code in controller

    public function index(Request $request)
{
    $user=User::orderBy('created_at', 'ASC');
    if($request->get('search'))
    {
        if ($request->get('type')) {
            $user->where('type', $request->get('type'));
        }
        if ($request->get('id')) {
            $user->where('id', (integer)$request->get('id'));
        }
        if ($request->get('first_name')) {
            $user->where('first_name', $request->get('first_name'));
        }
        if ($request->get('email')) {
            $user->where('email', $request->get('email'));
        }
    }


    $users = $user->paginate(20);
    $user->appends(['search' => $request->get('search')]);
    return view('admin.user.index', compact('users'));
}

But I get this error

Call to undefined method Illuminate\Database\Query\Builder::appends()

How I can fix this error or how I can make filter works with all pages ?

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