Forum: Ruby on Rails contact form

Hi
I would like to have on my website a contact form: name, email, subject 
(drop-down
list), a message, all this that would be dave in db, and a backend 
(admin)
to answer questions + some options like filtering by subject, sort by 
date ,
...
does know a gem that exists already or an app that would have such a 
module that
I can retrieve?

thank you