Best way to implement simple sorting / searching in Rails

What's the best way to implement an interface that looks like this in rails?

Currently I'm using Searchlogic, and it's a tad painful. Problems include:

• Making sure certain operations remain orthogonal -- for example, if you select "Short Posts" and then search, your search results should be restricted to short posts.

• Making sure the correct link gets the "selected" class. Right now the links are <a>'s, so maintaining this state client-side is tricky. I'm hacking it by having the AJAX response to, say, sorting return a new sort links section with the correct link "selected". Using radio buttons instead of <a> tags would make it easier to maintain state client-side -- maybe I should do that?

I recently solved a similar problem using named_scopes and some ruby metaprogramming that I rolled up into a plugin called find_by_filter.

find_by_filter accepts a hash of scope names and values, and chains them into parametised scope calls. If the model has a named_scope that matches the provided name, this is called.If no named_scope is found, an anonymous scope is created.