Sokil\Mongo\Structure::__get PHP Method

    public function __get($name)
    {
        // get first-level value
        return isset($this->data[$name]) ? $this->data[$name] : null;
    }

 public function __get($name)
 {
     if ($this->getRelationManager()->isRelationExists($name)) {
         // resolve relation
         return $this->getRelationManager()->getRelated($name);
     } else {
         // get document parameter
         return parent::__get($name);
     }
 }