fixes #429

lib/Doctrine/Record.php

@@ -437,7 +437,7 @@ abstract class Doctrine_Record extends Doctrine_Record_Abstract implements Count
     public function hydrate(array $data)
     {
         $this->_values = $this->cleanData($data);
-        $this->_data   = $data;
+        $this->_data   = array_merge($this->_data, $data);
 
         $this->prepareIdentifiers(true);
     }