array(
				'meta_key'               => '_llms_parent_course',
				'meta_value'             => $this->get( 'id' ),
				'post_type'              => 'lesson',
				'posts_per_page'         => -1,
				'no_found_rows'          => true,
				'update_post_meta_cache' => false,
				'update_post_term_cache' => false,
				'fields'                 => 'ids',
				'orderby'                => 'ID',
				'order'                  => 'ASC',