[TYPO3-mvc] sys_category in own extension not working after 6.2 upgrade

[Jan Kornblum]

Hi François,

>> After an upgrade to 6.2.x, the assigned categories are not longer shown
>> in the backend editing forms category tree (all checkboxes are
>> unchecked, the tree itself is rendered correctly). The relations
>> themselfes still seem to exist, as in FE everything still matches.
>
> Since 6.2, it is possible to have multiple categories fields for a given 
> table. Hence we now also make use of the column "fieldname" in the 
> "sys_category_record_mm" table. When upgrading from 6.1, they will be empty, 
> hence the BE does not find relations anymore.
>
> So you should just run an UPDATE statement in SQL to fill all the "fieldname" 
> columns with "categories" (the name of the field). You should also ideally 
> adapt your extension to take this into account, in case someone adds an extra 
> category field to one of your tables.

Great, thanks a lot!

Kind regards, Jan