TYPO3 Core

This is an issue in the TYPO3 core. It does not check if MM relations did change, it simply assumes that they did change. Or rather, it lacks the code to check this :)

The method responsible lacking the code is

t3lib_tcemain::compareFieldArrayWithCurrentAndUnset()

- it unsets all fields that did not change, and refuses to unset any MM-relation field. So the mm field - in our case tx_damttcontent_files - is seen as modified and thus logged.

You can reproduce this with a tiny extension created by the extension kickstarter:

• create new extension with (old) kickstarter
• extend existing table: tt_content
• Field type: database relation
• Activate "True M-M relations". This is the key here.
• Create relation to table: pages or tt_content (does not matter)
• Write and activate this extension

Edit the tt_content record, choose some pages or content elements in the new field, and save it 2 times. It will always be listed as changed:

MM related content elements 206 tt_content_206