extract_callstack_for_multiparameter_attributes

# File activerecord/lib/active_record/attribute_assignment.rb, line 86
    def extract_callstack_for_multiparameter_attributes(pairs)
      attributes = {}

      pairs.each do |(multiparameter_name, value)|
        attribute_name = multiparameter_name.split("(").first
        attributes[attribute_name] ||= {}

        parameter_value = value.empty? ? nil : type_cast_attribute_value(multiparameter_name, value)
        attributes[attribute_name][find_parameter_position(multiparameter_name)] ||= parameter_value
      end

      attributes
    end