def undo_changes!
      Petra.current_transaction.current_section.log_attribute_change_veto(object,
                                                                          attribute:      attribute,
                                                                          external_value: external_value)
    end
def undo_changes!
      Petra.current_transaction.current_section.log_attribute_change_veto(object,
                                                                          attribute:      attribute,
                                                                          external_value: external_value)
    end
Tells the transaction to ignore all changes previously done to the current
 attribute in the transaction.