Apologies for the tone. RoR website does not describe itself as 'full stack', neither is it a full-stack framework in the modern sense since there is no client-side library other than the ajax helpers.
Next.js is not a 'client side framework' in the usual sense, as it encompasses server side rendering, but it doesn't mean you'll be writing your backend logic in it (unless you want to) or that it will include an ORM.
Next.js is not a 'client side framework' in the usual sense, as it encompasses server side rendering, but it doesn't mean you'll be writing your backend logic in it (unless you want to) or that it will include an ORM.