From c82794bff79009ee67974eed0b670b8d76e646d1 Mon Sep 17 00:00:00 2001
From: Marco Pivetta <ocramius@gmail.com>
Date: Sat, 17 Jan 2015 04:09:14 +0100
Subject: [PATCH] #1178 - handling traversal of association mapping data in
 lazy-loading many-to-many requests on the inverse side

---
 lib/Doctrine/ORM/Utility/PersisterHelper.php | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/Doctrine/ORM/Utility/PersisterHelper.php b/lib/Doctrine/ORM/Utility/PersisterHelper.php
index 28b7748ed..ded5e9ca0 100644
--- a/lib/Doctrine/ORM/Utility/PersisterHelper.php
+++ b/lib/Doctrine/ORM/Utility/PersisterHelper.php
@@ -92,11 +92,21 @@ class PersisterHelper
 
         $assoc = $class->associationMappings[$fieldName];
 
-        if (count($assoc['sourceToTargetKeyColumns']) > 1) {
+        if (! $assoc['isOwningSide']) {
+            return self::getTypeOfField($assoc['mappedBy'], $em->getClassMetadata($assoc['targetEntity']), $em);
+        }
+
+        if (($assoc['type'] & ClassMetadata::MANY_TO_MANY) > 0) {
+            $joinData = $assoc['joinTable'];
+        } else {
+            $joinData = $assoc;
+        }
+
+        if (count($joinData['joinColumns']) > 1) {
             throw QueryException::associationPathCompositeKeyNotSupported();
         }
 
-        $targetColumnName = $assoc['joinColumns'][0]['referencedColumnName'];
+        $targetColumnName = $joinData['joinColumns'][0]['referencedColumnName'];
         $targetClass      = $em->getClassMetadata($assoc['targetEntity']);
 
         return self::getTypeOfColumn($targetColumnName, $targetClass, $em);