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Location AR

View location_ar.rb
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class Location < ActiveRecord::Base
validates :city, :uniqueness => {:scope => :country}
 
def self.get country, city
location = Location.find_by_country_and_city(country, city)
raise "There is no '#{city}' in '#{country}'" unless location
location.readonly!
location
end
 
...
end
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