Filtering results through URL (e.g. new?forum_id=3)

Is there a special code you have to place in the routes so filtering
results through the URL works?

For example, Ruby Forum does it with:

http://www.ruby-forum.com/topic/new?forum_id=3
http://www.ruby-forum.com/topic/new?forum_id=5
http://www.ruby-forum.com/topic/new?forum_id=7
etc.

Any ideas?
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