Sokil\Mongo\Structure::merge PHP Method

    public function merge(array $data)
    {
        $this->mergePartial($this->data, $data);
        return $this;
    }

 public function merge(array $data)
 {
     if ($this->isStored()) {
         foreach ($data as $fieldName => $value) {
             $this->set($fieldName, $value);
         }
     } else {
         parent::merge($data);
     }
     return $this;
 }