[Flow] Multi step form - save values in session

[Mark Kuiphuis]

Hi all,

I am trying to get a form working which will be spread out over multiple 
pages. Each step will need to save the values in a session object.

So I have created a model with scope session which contains all the 
fields amongst the 6 steps in the form.

At the first "saveStep1Action()" where I create a new object of this 
model and assign the values from the form with setters and finally save 
the (partially completed) model in the session it all goes well.
I don't want to put "rubbish" in the database yet, that's why I want to 
use the session

However, after wanting to save the values from the 2nd step of the form 
in the same model I first need to retrieve the model from the session.

So, I am using the following line of code to do that.

$session = $this->sessionManager->getCurrentSession();
if ($session->hasKey('member')) {
    $member = $session->getData('member');
}

When I output this information with \TYPO3\Flow\var_dump($member) I do 
see the values from the 1st step in the form...so storing the session 
works well.

echo gettype($member) shows "Object" and
echo get_type($member) shows "\My\Package\Domain\Session\Model\Member" 
(this model does exist in this non-conventional Flow folder)

I am unable to use any more setters on this model and save the newly 
updated model in the session again.

$session->getData('member') returns an array, although get_class and 
gettype tell me otherwise....

Because of the array being returned I have tried to use the 
propertyMapper to convert the session data to my model by issuing:

$member = $this->propertyMapper->convert($session->getData('member'), 
'My\Package\Domain\Session\Model\Member');

but still it won't set the values from the second step of the form.

Anyone has any ideas how to save one session model in multiple steps?

Kind regards,

Mark Kuiphuis