creating data in foreach loop

I am trying to save additional data to a jointable, but there is a problem with foreach loop, in which I create all necessary data to be passed and saved. 

  foreach ($this->request->data['Parts']['add_ids'] as $part) {


              $this->request->data['parts']['_ids'][] = $part;


              $this->request->data['parts'] = array(

                    0 => array(

                    'id' => $part,
            '_joinData' => array(

            'state' => $state,
            ),
            ),
            );
            }

In this case only the latest one is saved. 

When I change to   $this->request->data['parts'][]

foreach ($this->request->data['Parts']['add_ids'] as $part) {


              $this->request->data['parts']['_ids'][] = $part;


              $this->request->data['parts'][] = array(

                    0 => array(

                    'id' => $part,
            '_joinData' => array(

            'state' => $state,
            ),
            ),
            );
            }

Both records are saved but with $state = null.

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