From 1fecff9cc7aaeb8859257b900792e75934df1cc1 Mon Sep 17 00:00:00 2001
From: UndefinedOffset <echipman@webbuildersgroup.com>
Date: Thu, 13 Apr 2017 10:17:22 -0300
Subject: [PATCH] Switched order of the is_subclass_of check (Fixes #99)

---
 code/forms/GridFieldSortableRows.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/forms/GridFieldSortableRows.php b/code/forms/GridFieldSortableRows.php
index 1e43c46..797b6cb 100644
--- a/code/forms/GridFieldSortableRows.php
+++ b/code/forms/GridFieldSortableRows.php
@@ -190,7 +190,7 @@ class GridFieldSortableRows implements GridField_HTMLProvider, GridField_ActionP
 		if (!$many_many) {
 			$sng=singleton($gridField->getModelClass());
 			$fieldType=$sng->db($this->sortColumn);
-			if(!$fieldType || !(strtolower($fieldType) == 'int' || is_subclass_of('Int', $fieldType))) {
+			if(!$fieldType || !(strtolower($fieldType) == 'int' || is_subclass_of($fieldType, 'Int'))) {
 				if(is_array($fieldType)) {
 					user_error('Sort column '.$this->sortColumn.' could not be found in '.$gridField->getModelClass().'\'s ancestry', E_USER_ERROR);
 				}else {