How to overwrite devise user session attributes?

I'm using devise for authentication:
In my user model I've do:

def name
    "#{first_name} #{last_name}"
end

to have a name method.
After signed in successfully I can use current_user.name.
I want to overwrite name method if the user is guest.
That's the use case:

The guest user signed in successfully, now its name is, for example,
"guest" " guest".
current_user.name is guest guest.
After signed in I present a form with a name input field and a surname
input field.
Submitting the form I want to overwrite the name value with input fields values.
So if name and surname are: "newguest" "newguest" I want
current_user.name have newguest newguest.
There a way to do this?
Thank you.

No ideas?

Save the new "names" in session or directly in a cookie.

Yes I want to save in session but how can access the session?
user_session hash is empty.

session["foo"] = "bar"

Of course it's empty until you put something there :slight_smile:

Sorry but I don't undestand very well.
In https://github.com/plataformatec/devise is said that user_session
is an helper to access the session of the successfully signed in user.
So after signed in I expect to find something in user_session so that
I can change some of its values.

I don't know about devise's "user_session" offhand, but it doesn't really
matter. You can put anything you want (within reason!) in session in
your app.

session["guest_first_name"] = "Bob"

Whatever. Just try it.