[TYPO3-mvc] Configuration of checkbox groups

[Robert Böttner]

Hi all,

> I added the @dontverifyrequesthash already. The request finishes with no exception and all other object attributes in the same request get persisted as expected. I´ll investigate that further today...
The configuration was correct. The problem was related to another problem with a file upload field in the same form. But to get the POST array  serialized and persistable I needed to add this line to my controller:
$app->setCountries(json_encode($app->getCountries()));

One could of course also serialize() or implode() whatever serves the individual model/purpose better.

Have fun
Robert.