protected function setCategoryGroup($category_group_id)
    {
        $this->data_category_group = array();

        if (is_numeric($category_group_id)) {

            $conditions = array(
                'language' => 'und',
                'category_group_id' => $category_group_id
            );

            $this->data_category_group = $this->category_group->get($conditions);

            if (empty($this->data_category_group)) {
                $this->outputHttpStatus(404);
            }

            $this->prepareCategoryGroup($this->data_category_group);
        }
    }