protected function loadModelsOneToOne($attribute)
    {
        $data = $this->relationalData[$attribute];

        $activeQuery = $data['activeQuery'];
        $class = $activeQuery->modelClass;

        $model = new $class($data['data']);
        if (isset($this->relations[$attribute]) && is_callable($this->relations[$attribute])) {
            $model = call_user_func($this->relations[$attribute], $model, $data['data']);
        }
        $data['newModels'][] = $model;

        $this->relationalData[$attribute] = $data;
    }