class Customer
    def self.find_by_identifiers(id_or_url_name)
      if id_or_url_name.is_a? Numeric
        find_by_id(id_or_url_name)
      elsif id_or_url_name.is_a? String and id_or_url_name.index(/\D/).nil?
	# id_or_url_name is a string representing a number
				find_by_id(id_or_url_name)
      else
        find_by_url_name(id_or_url_name)
      end
    end
end