class ISO3166::Country

def find_all_by(attribute, val)
  raise "Invalid attribute name '#{attribute}'" unless AttrReaders.include?(attribute.to_sym)
  attribute = ['name', 'names'] if attribute == 'name'
  Data.select do |k,v|
    Array(attribute).map do |attr|
      if v[attr].kind_of?(Enumerable)
        v[attr].map{ |n| n.downcase }.include?(val)
      else
        v[attr] && v[attr].downcase == val
      end
    end.uniq.include?(true) 
  end
end