write_attribute

# File activerecord/lib/active_record/base.rb, line 1581
      def write_attribute(attr_name, value)
        attr_name = attr_name.to_s
        if (column = column_for_attribute(attr_name)) && column.number?
          @attributes[attr_name] = convert_number_column_value(value)
        else
          @attributes[attr_name] = value
        end
      end