How to pass value from <select> - to method of Rails-controller?

Hello.

I would like to share my problem with you.
How to pass value from - in this or that, depending on select, method of Rails-controller? If id of (or name) selected is 'one', it should be passed to 'def one'. If id of selected is 'two', it should be passed to 'def two'. etc How to solve this puzzle? Thank you for your answer.