[2.0][DDC-211] Fixed collection diff calculation.

lib/Doctrine/ORM/PersistentCollection.php

@@ -275,7 +275,8 @@ final class PersistentCollection implements \Doctrine\Common\Collections\Collect
      */
     public function getDeleteDiff()
     {
-        return array_udiff($this->_snapshot, $this->_coll->toArray(), array($this, '_compareRecords'));
+        return array_udiff_assoc($this->_snapshot, $this->_coll->toArray(),
+                function($a, $b) {return $a === $b ? 0 : 1;});
     }
 
     /**
@@ -286,17 +287,8 @@ final class PersistentCollection implements \Doctrine\Common\Collections\Collect
      */
     public function getInsertDiff()
     {
-        return array_udiff($this->_coll->toArray(), $this->_snapshot, array($this, '_compareRecords'));
-    }
-
-    /**
-     * Compares two records. To be used on _snapshot diffs using array_udiff.
-     *
-     * @return integer
-     */
-    private function _compareRecords($a, $b)
-    {
-        return $a === $b ? 0 : 1;
+        return array_udiff_assoc($this->_coll->toArray(), $this->_snapshot,
+                function($a, $b) {return $a === $b ? 0 : 1;});
     }
 
     /**