php - Baum nested set, how to get category in random order? -

i'm using baum nested set category , sub-category in application laravel 5.2 (the categories use them menu), want menu keep changing on page refresh , when user navigate different pages.

just wondering if there's way can fetch category using baum nested set in random order.

currently using:

category::all()->tohierarchy()->get(); 

it works fine, when try

category::inrandomorder()->tohierarchy()->get(); 

doesn't work.

anyone tried before?