Rails - Apr 2006 - Stackable URLs

Here''s my problem...

Suppose you have a page that lists some data. You also have some URLs 
that can be used to filter that data.

Lets say you have a few links that filter by type. When you click on 
them you get URLs like this one:
http://localhost/controller/action?type=SOMETYPE

Then you click on a link that filters by date. When you click on this 
url you would normally get something like this:
http://localhost/controller/action?date=SOMEDATE

But since I previously clicked on another URL I want to get something 
like this:
http://localhost/controller/action?type=SOMETYPE&?date=SOMEDATE

Then if I click on a different URL that sorts by type I want to get 
something like this:
http://localhost/controller/action?type=SOMEOTHERTYPE&?date=SOMEDATE

Well, I think you get the idea.

Something like this can be seen at Yahoo Finance: 
http://finance.yahoo.com/q/ta?s=ERTS


How would I be able to achieve something like this in Rails. The easier 
the better ;)

Many thanks in advance,

Alex

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