If you've built a form using the ActiveRecord form helpers and as such have form elements called "some_object[some_attribute]" and make the form use GET rather than POST, you'll encounter trouble when trying to use the URL rewriter. This is because there's now another hash in the parameters hash, which it doesn't handle properly. It will make a mess of the query string and it will no longer work as expected.
It's 6:13 AM and I've been up hacking most of the night so that summary might not make as much sense, but I have attached a patch to fix the problem which also adds a unit test that illustrates how the issue is encountered.
