[TYPO3-core] RFC: Bugfix #12688: MM relations: rollback not working / sys_history wrong

[Ralf Hettinger]

Reminder #2

Am 06.01.2010 12:44 schrieb Ralf Hettinger:
> Reminder #1 on occasion of the upcoming 4.3.1.
> 
> Regards
> Ralf
> 
> Am 20.11.2009 22:07 schrieb Ralf Hettinger:
>> This is an SVN patch request.
>>
>> Type: Bugfix
>>
>> Bugtracker references:
>> http://bugs.typo3.org/view.php?id=12688
>> http://bugs.typo3.org/view.php?id=5184
>>
>> Branches: trunk
>>
>> Problem:
>> If changing fields which reference MM relations, sys_history will log
>> these changes by storing a different relation count instead of the
>> different referenced records. A rollback will therefore restore the
>> wrong relations (relation to a record with uid=old relation count will
>> be restored) and the record's history shows wrong information.
>> Furhtermore, if only the MM-relations change on updating a record but
>> the relation count stays the same, nothing at all will be stored to
>> sys_log / history, since the similarity check will result in no update
>> required.
>>
>> Solution:
>> Instead of logging the relation count, log the referenced uids to
>> sys_history on MM fields, if they changed
>> (http://bugs.typo3.org/view.php?id=12688 ). Always perform an update on
>> records, if they contain MM-relations
>> (http://bugs.typo3.org/view.php?id=5184 ).
>>
>> Cheers,
>> Ralf