# File lib/active_record/persistence.rb, line 192
    def update_column(name, value)
      name = name.to_s
      raise ActiveRecordError, "#{name} is marked as readonly" if self.class.readonly_attributes.include?(name)
      raise ActiveRecordError, "can not update on a new record object" unless persisted?
      raw_write_attribute(name, value)
      self.class.update_all({ name => value }, self.class.primary_key => id) == 1
    end