/**
  * Check whether the autoEagerLoading feature has to be applied.
  *
  * @param string $fetch
  */
 protected function applyAutoEagerLoading($fetch = 'unit')
 {
     if (!empty($this->eagerLoad)) {
         return;
     }
     if ($this->enableAutoEagerLoading && $fetch == 'unit') {
         $this->eagerLoad = $this->model->unitRelations();
     } elseif ($this->enableAutoEagerLoading && $fetch == 'list') {
         $this->eagerLoad = $this->model->listRelations();
     }
 }