Models more than Databases

Hi Guys,

I would like some advice - I am new to Rails although not new to
development. I have read numerous rails tutorials - however they all
seem to build around forms interacting with a database. My question is
how do models/controllers work when it goes beyond just adding things
into databases?

For instance if I was to build a hotel booking engine, and I want to
build out the 'search' functionality. The search functionality has 3
basic elements.

1) Store the Users search requirements (e.g. destination, dates, rooms)
in a table - this obviously is easy with rails (based on a users search
2) Perform a search against a 3rd party XML feed.
3) Store results in another database table.

My question is - what logic should go in a controller? and what should
go in the models?

The user will enter data into a form, which will have a controller and
action, so should there be a separate model for each of the 3 above ?
and one controller? whats the best practice for doing such things or is
there some good tutorials on how to architect a solution with rails?