# File lib/active_record/base.rb, line 1733
      def assign_attributes(new_attributes, options = {})
        return unless new_attributes

        attributes = new_attributes.stringify_keys
        multi_parameter_attributes = []
        @mass_assignment_options = options

        unless options[:without_protection]
          attributes = sanitize_for_mass_assignment(attributes, mass_assignment_role)
        end

        attributes.each do |k, v|
          if k.include?("(")
            multi_parameter_attributes << [ k, v ]
          elsif respond_to?("#{k}=")
            send("#{k}=", v)
          else
            raise(UnknownAttributeError, "unknown attribute: #{k}")
          end
        end

        @mass_assignment_options = nil
        assign_multiparameter_attributes(multi_parameter_attributes)
      end