[Flow] RestController - updated Objects are not persisted

[Robert Berghegger]

Hello everyone,

I have a question belonging to the RestController.

My routing-setup:

-
   name: 'Single CD URI'
   uriPattern: 'cd/{cd}'
   defaults:
     '@package': 'Berghegger.CD'
     '@controller': 'CD'

-
   name: 'CD List URI'
   uriPattern: 'cd'
   defaults:
     '@package': 'Berghegger.CD'
     '@controller': 'CD'

Everytime I create an CD-Object with a HTTP-POST to:

http://flow.robert-pc/index.php/cd

with a Body like this:

cd[title]=Eternal Movement&cd[artist]=Tides from nebula

It is successfull persited and I can retreive the Object with a HTTP-GET to:

http://flow.robert-pc/index.php/cd/b068de1b-e53e-706f-a17e-a7b08176ca92

the result looks like this:

 1. {
 2. "artist": "Tides from nebula",
 3. "title": "Eternal Movement",
 4. "__identity": "b068de1b-e53e-706f-a17e-a7b08176ca92"
 5. } 

I can also delete this object. So far, so good.

But when I try to update this Object with a HTTP-PUT the changes are not 
persisted, though the updateAction is triggered.

     /**
      *
      * @param \Berghegger\CD\Domain\Model\CD $cd The updated CD-Object
      * @return void
      */
     public function updateAction(CD $cd) {
         $this->cdRepository->update($cd);
         $this->response->setStatus(201);

     }

What am i doing wrong?

Kind regards,

Robert