Fixed issue with parent ID strategy

- Uses getDocuemntId and not ->getIdentifierValue to determine path of
  document.

Author: dantleech

AutoRoute/RouteMaker/AutoRouteMaker.php

@@ -97,8 +97,7 @@ protected function getAutoRouteForDocument($document)
 
     protected function documentIsPersisted($document)
     {
-        $metadata = $this->dm->getClassMetadata(get_class($document));
-        $id = $metadata->getIdentifierValue($document);
+        $id = $this->dm->getUnitOfWork()->getDocumentId($document);
         $phpcrSession = $this->dm->getPhpcrSession();
         return $phpcrSession->nodeExists($id);
     }

Tests/Unit/AutoRoute/RouteMaker/AutoRouteMakerTest.php

@@ -48,8 +48,8 @@ public function setUp()
     protected function setupDocumentPersisted($isPersisted)
     {
         $this->dm->expects($this->any())
-            ->method('getClassMetadata')
-            ->will($this->returnValue($this->metadata));
+            ->method('getUnitOfWork')
+            ->will($this->returnValue($this->uow));
         $this->dm->expects($this->once())
             ->method('getPhpcrSession')
             ->will($this->returnValue($this->phpcrSession));
@@ -77,10 +77,6 @@ public function testCreateOrUpdateAutoRouteForExisting()
             ->method('getContent')
             ->will($this->returnValue($this->doc));
 
-        $this->dm->expects($this->once())
-            ->method('getUnitOfWork')
-            ->will($this->returnValue($this->uow));
-
         $this->autoRouteStack->expects($this->once())
             ->method('addRoute')
             ->with($this->autoRoute1);