static function saveExampleServices($example_id, $service_ids)
 {
     //print_r ($example_id);
     //print_r ($service_ids);
     //ExampleService::deleteAll('example_id = '. $example_id);
     ExampleService::deleteAll(['example_id' => $example_id]);
     //print_r($example_id);
     foreach ($service_ids as $service_id) {
         //$user = User::find()->where(['name' => 'CeBe'])->one();
         $model = ExampleService::find()->where(['example_id' => $example_id, 'service_id' => $service_id])->one();
         if (!$model) {
             $model = new ExampleService();
             $model->service_id = $service_id;
         }
         //print_r($model);
         $model->example_id = $example_id;
         $model->save();
     }
     return true;
 }