/**
  * Add Transit Transformers based on the attachment settings.
  *
  * @param Model $model
  * @param \Transit\Transit $transit
  * @param array $attachment
  */
 protected function _addTransformers(Model $model, Transit $transit, array $attachment)
 {
     if (empty($attachment['transforms'])) {
         return;
     }
     foreach ($attachment['transforms'] as $options) {
         $transformer = $this->_getTransformer($options);
         if ($options['self']) {
             $transit->addSelfTransformer($transformer);
         } else {
             $transit->addTransformer($transformer);
         }
     }
 }