gistfile1.txt

            
            if (!empty($form['Ad']['AdService']))
            {
                $services = [];
                            
                foreach ($form['Ad']['AdService'] as $service)
                {
                    array_push($services, [
                        'id' => $this->AdService->field('id', [
                            'AdService.ad_id'      => $ad_id,
                            'AdService.service_id' => $service,
                        ]),
                        'service_id' => $service,
                        'ad_id'      => $ad_id,
                    ]); 
                }

                $form['Ad']['AdService'] = $services;
            }
            else
            {
                $form['Ad']['AdService'] = []; 
            }