Generate Parameters for a filter

Hey all,

I want to filter /game/list by several different parameters. If I
type in a url like /game/list/?category=5&players=2 category and
players come in on the params hash.

Is there a railsy way to generate such a url? I would like to be able
to change the filter options individually without affecting the
others. For example, to be able to easily change it to /game/list?
category=3&players=2 without any string parsing.

Or, if this is the wrong approach, how should I be sending filter
options to my game controller?

Thanks for your help!