public static function get_lesson_options_for_select_list() {

		$lessons = self::get_posts( 'lesson' );

		$options = array();

		if ( ! empty( $lessons ) ) {

			foreach ( $lessons as $key => $value ) {

				// Get parent course if assigned.
				$parent_course = get_post_meta( $value->ID, '_llms_parent_course', true );

				if ( $parent_course ) {
					$title = $value->post_title . ' ( ' . get_the_title( $parent_course ) . ' )';
				} else {
					$title = $value->post_title . ' ( ' . __( 'unassigned', 'lifterlms' ) . ' )';
				}

				$options[ $value->ID ] = $title;

			}
		}

		return $options;

	}