Ruby on Rails

I have a photos model which has a field for a gallery title, I have a
gallery controller which currently shows all photos that don't have an
empty gallery title field.

I want to have on my gallery page a photo from each gallery that has a
unique title, which would link to 'gallery/gallery-title', a page for
gallery.
(ie say I set one gallery title to 2009 and another to 2010 then I'd
have 2 seperate galleries)

I've been reading/searching but I don't know how to implement this.
How do I use the gallery titles to find and sort the photos??
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