[Flow] Could not safe unidirectional ManyToMany data

[Steffen Wickham]

Hello everybody,

I'm extending my latest tool and want to add a function for saving the 
seen status of an issue. I thought a unidirectional ManyToMany relation 
as described in [1] between my Issue- and my Party-model will work it 
out but I'm running into troubles. When I add a Party to the 
"seenByUsers" attribute of Issue it will be added successfully to the 
model (tested via var_dump) but when I persist it, it wouldn't be saved. 
There are no error or debug messages which help to track this problem 
down. Maybe you can help me and see my mistake....

I put the relevant parts to [2] but removed some unneccessary parts. I 
know my naming of these attributes is not the best but I couldn't find 
any better name. Anyways: Tables and such stuff is genrated successfully 
and I have to use persistAll as the showAction is a GET-Only method. Any 
help is really appreciated! :)

Best regards,
Steffen

[1] 
http://wiki.typo3.org/Flow_Cookbook#Create_unidirectional_one-to-many_relations
[2] https://gist.github.com/BlackIPS/2466eba0b86a4597ee79