i'm workign through agile web dev with rails. i understand the scaffold and that it generates forms based off of your db definitions.
i'm curious how one would structure an app (or portion thereof) that didn't use a db? let's say i wanted an input box like so...
Enter Number: [text box here]
[Enter link here]
i would then like it to then display a different page with the number multiplied by 2. i know the math s/b stuck in the controller. i think ruby has a post method, but i don't know how to use it.
how would i display the result in the same page?
general answers with code snippets would probably be sufficient.