[Rails] Sessions and token

Hi all,

If I was to create a mobile app connecting to Michael Hartl's tutorial
ROR3 application... in order for me to implement a "always remember
me" model, would a user just sign up once and get a token, and use
that same token every time the mobile app runs. Or do I save the
credentials and then log in behind the scenes every time the app
opens, and then use a new token every app launch?

Thanks!

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