easy question, how would i search a grandparent???!

hi,
i have this in my code

Article.find_by_contents("#{searchstring} +city:#{passedincity}")

well that returns to me only articles that belong to whatever the user
selected in city.

now is it possible to search the grandparent?

for example

class country
has_many states

class states
has_many cities
belongs_to country

class city
belongs_to states

......

i would like to search articles that only belong to a country.
something like...
Article.find_by_contents("#{searchstring}
+states.country:#{passedincountry}")

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