# File lib/big_record/model.rb, line 554
    def extract_callstack_for_multiparameter_attributes(pairs)
      attributes = { }

      for pair in pairs
        multiparameter_name, value = pair
        attribute_name = multiparameter_name.split("(").first
        attributes[attribute_name] = [] unless attributes.include?(attribute_name)

        position = find_parameter_position(multiparameter_name)
        value = value.empty? ? nil : type_cast_attribute_value(multiparameter_name, value)
        attributes[attribute_name] << [position, value]
      end
      attributes.each { |name, values| attributes[name] = values.sort_by{ |v| v.first }.collect { |v| v.last } }
    end