Adds 'rand' as one of the valid params for 'orderby' in rest controller. #551

src/classes/api/class-tainacan-rest-controller.php

@@ -363,7 +363,8 @@ class REST_Controller extends \WP_REST_Controller {
 				'title',
 				'meta_value',
 				'meta_value_num',
-				'menu_order'
+				'menu_order',
+				'rand'
 			),
 		);