# File lib/declarative_authorization/authorization.rb, line 613
    def object_attribute_value (object, attr)
      begin
        object.send(attr)
      rescue ArgumentError, NoMethodError => e
        raise AuthorizationUsageError, "Error occurred while validating attribute ##{attr} on #{object.inspect}: #{e}.\n" +
          "Please check your authorization rules and ensure the attribute is correctly spelled and \n" +
          "corresponds to a method on the model you are authorizing for."
      end
    end