How do I validate a non-model form in Rails 3?
With Rails 3 you can extend "plain old Ruby objects" with someActiveModel extensions like Validations etc. ActiveRecord is extension of ActiveModel with DB support. Here is a very good Railscast describing it with easy example:
In Rails 3 the non-database functionality of Active Record is extracted out into Active Model. This allows you to cleanly add validations and other features to tableless models. http://railscasts.com/episodes/219-active-model
You can try to use tableless model. Check out here for more infomation: http://railscasts.com/episodes/193-tableless-model