From e00596e818ac5aea2e94cb376b2b2006e8b8da88 Mon Sep 17 00:00:00 2001
From: Daniel Hensby <git@hens.by>
Date: Fri, 11 May 2018 16:07:28 +0100
Subject: [PATCH] FIX Work with ManyManyThroughList

---
 src/GridFieldOrderableRows.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/GridFieldOrderableRows.php b/src/GridFieldOrderableRows.php
index 83b34ce..9a1558e 100755
--- a/src/GridFieldOrderableRows.php
+++ b/src/GridFieldOrderableRows.php
@@ -19,6 +19,7 @@ use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataObjectInterface;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\ManyManyList;
+use SilverStripe\ORM\ManyManyThroughList;
 use SilverStripe\ORM\Map;
 use SilverStripe\ORM\SS_List;
 use SilverStripe\ORM\FieldType\DBDatetime;
@@ -183,7 +184,7 @@ class GridFieldOrderableRows extends RequestHandler implements
     {
         $field = $this->getSortField();
 
-        if ($list instanceof ManyManyList) {
+        if ($list instanceof ManyManyList || $list instanceof ManyManyThroughList) {
             $extra = $list->getExtraFields();
 
             if ($extra && array_key_exists($field, $extra)) {
@@ -211,7 +212,7 @@ class GridFieldOrderableRows extends RequestHandler implements
     public function getSortTable(SS_List $list)
     {
         $field = $this->getSortField();
-        if ($list instanceof ManyManyList) {
+        if ($list instanceof ManyManyList || $list instanceof ManyManyThroughList) {
             $extra = $list->getExtraFields();
             $table = $list->getJoinTable();
             if ($extra && array_key_exists($field, $extra)) {