public function actionCategoryTree()
{
	$categories = CategoryTree::find()
		->joinWith('lang')
		->andWhere(['parent_id' => 1])
		->all();
	$categoryTree = [];
	foreach ($categories as $category) {
		/**
		* @var $category CategoryTree
		*/
		$children = $category->children()->joinWith('lang')->all();
		$childrens = [];
		if (!empty($children) && is_array($children)) {
			foreach ($children as $categoryChildren) {
				$childrens[] = [
					'id' => $categoryChildren->id,
					'text' => $categoryChildren->lang->name
				];
			}
		} else {
			$children = CategoryTree::find()
				->joinWith('lang')
				->andWhere(['parent_id' => $category->id])
				->orderBy('id')
				->all();
			if (!empty($children) && is_array($children)) {
				foreach ($children as $categoryChildren) {
					$childrens[] = [
						'id' => $categoryChildren->id,
						'text' => $categoryChildren->lang->name
					];
				}
			}
		}
		$categoryTree[] = [
			'id' => $category->id,
			'text' => $category->lang->name,
			'children' => $childrens
		];
	}

	Yii::$app->response->format = Response::FORMAT_JSON;
	return $categoryTree;
}