request->session return wrong value

I try to learn AJAX in this website. Then, I stumbled upon session in the controller. The author create the session like this:

Step 6: Create controller

$request->session()->put('sort', $request->has('sort') ? $request->get('sort') : ($request->session()->has('sort') ? $request->session()->get('sort') : 'asc'));

I try to alter the code to suit my app but it return Order direction must be "asc" or "desc".

This is my code:

$request->session()->put('search', $request->has('search') ? $request->get('search') : ($request->session()->has('search') ? $request->session()->get('search') : ''));
$request->session()->put('field', $request->has('field') ? $request->get('field') : ($request->session()->has('field') ? $request->session()->get('field') : 'user_id'));
$request->session()->put('sort', $request->has('sort') ? $request->get('sort') : ($request->session()->has('sort') ? $request->session()->get('sort') : 'asc'));

When I try to dump the session()->get(sort), it always return session[field] value.

This is my dd() code:

dd('field: '.$request->session()->get('field').', sort: '.$request->session()->get('sort'));

and it return "field: user_id, sort: user_id"

I'll update my code per ask. TIA.

via Chebli Mohamed