public function get_attendees_by_id( $post_id, $post_type = null ) {
		if ( ! $post_type ) {
			$post_type = get_post_type( $post_id );
		}

		switch ( $post_type ) {
			case $this->ticket_object:
				$attendees = $this->get_attendees_by_product_id( $post_id );

				break;
			case $this->attendee_object:
				$attendees = $this->get_all_attendees_by_attendee_id( $post_id );

				break;
			case $this->order_object:
				$attendees = $this->get_attendees_by_order_id( $post_id );

				break;
			default:
				$attendees = $this->get_attendees_by_post_id( $post_id );

				break;
		}

		/**
		 * Filters the attendees returned after a query.
		 *
		 * @since 4.7
		 *
		 * @param array  $attendees
		 * @param int    $post_id The post ID attendees were requested for.
		 * @param string $post_type
		 */
		return apply_filters( 'tribe_tickets_plus_woo_get_attendees', $attendees, $post_id, $post_type );
	}