Merge pull request #1866 from insekticid/patch-1

Fixed #1567 - [Tree] verify() - relation as root

Author: l3pp4rd

lib/Gedmo/Tree/Entity/Repository/NestedTreeRepository.php

@@ -899,7 +899,19 @@ private function verifyTree(&$errors, $root = null)
         $config = $this->listener->getConfiguration($this->_em, $meta->name);
 
         $identifier = $meta->getSingleIdentifierFieldName();
-        $rootId = isset($config['root']) ? $meta->getReflectionProperty($config['root'])->getValue($root) : null;
+        if (isset($config['root'])) {
+            if (isset($config['root'])) {
+                $rootId = $meta->getReflectionProperty($config['root'])->getValue($root);
+                if (is_object($rootId)) {
+                    $rootId = $meta->getReflectionProperty($identifier)->getValue($rootId);
+                }
+            } else {
+                $rootId = null;
+            }
+        } else {
+            $rootId = null;
+        }
+
         $qb = $this->getQueryBuilder();
         $qb->select($qb->expr()->min('node.'.$config['left']))
             ->from($config['useObjectClass'], 'node')