gistfile1.txt

    public function add()
    {
        if ( ! $this->request->data) {
            $this->response->statusCode('400');
        } else {
            $data['feeds']['_ids'] = $this->request->data['feeds'];
            $calendars = TableRegistry::get('Calendars');
            $calendar = $calendars->get($this->request->data['id'], [
                'associated' => [
                    'Feeds',
                ],
            ]);
            debug($calendar);
            $calendar = $calendars->patchEntity($calendar, $data);
            debug($calendar);
            if ($calendars->save($calendar, ['associated' => ['Feeds']])) {
                echo 'yes';
            } else {
                echo 'no';
            }
            debug($calendar);
            die();