How do you use anchors for IDs in routes in Rails 3?

Imagine a blog with posts and comments. An individual comment's URL might be posts/741/comments/1220.

However, I'd like to make the URL posts/741#1220, or even posts/741#comment-1230.

What's the least intrusive way of doing this, so that redirect_to comment_path(my_comment) points to the correct URL?