little fix for pgsql sequence handling

lib/Doctrine/Connection/UnitOfWork.php

@@ -327,7 +327,12 @@ class Doctrine_Connection_UnitOfWork extends Doctrine_Connection_Module implemen
         $this->conn->insert($table->getTableName(), $array);
 
         if (empty($seq) && count($keys) == 1 && $keys[0] == $table->getIdentifier()) {
-            $id = $this->conn->sequence->lastInsertId();
+
+            if (strtolower($this->conn->getName()) == 'pgsql') {
+                $seq = $table->getTableName() . '_' . $keys[0] . '_seq'; 
+            }
+
+            $id = $this->conn->sequence->lastInsertId($seq);
 
             if ( ! $id) {
                 $id = $table->getMaxIdentifier();