<?php	

public function getGbookTreeData($articleId, $languageId = 1)
	{
		$data = $this->connection->table('gbook')->where('article_id', $articleId)->where('language_id', $languageId)->order('id ASC');

		$tree = array();

		foreach ($data as $item)
		{
			$tree[$item->parent__gbook_id][$item->id] = $item->toArray();
		}

		return $tree;
	}