[Rails] Rails 3 - Loading a Subnav with Ajax… Which controller owns a subnav?

Once my Rails 3 app is loaded, a user can click an item which needs to
then load a dynamic subnav.

My thinking is (since it needs to be dynamic) is onClick to make a
jQuery AJAX call to the server and then to inject the HTML response
into a DIV on the page...

What I'd like your advice on is how/where the subnav logic should live
in the rails app, as I don't have a navigation controller or view...
But maybe I should have one?

Do I create a navigation controller? Or use the application
controller? I also have a pages controller that I use for the landing
page, about, contact, etc...

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