[orm] refactoring extract method rollback transaction

Author: prusov

library/orm/persister/ObjectPersister.php

@@ -264,9 +264,7 @@ public function commit()
      */
     protected function rollback(array $connections)
     {
-        foreach ($connections as $connection) {
-            $connection->rollback();
-        }
+        $this->rollbackTransaction($connections);
         $this->unloadStorageObjects($this->newObjects);
         $this->unloadStorageObjects($this->modifiedObjects);
         $this->unloadStorageObjects($this->deletedObjects);
@@ -290,6 +288,20 @@ protected function startTransaction(array $connections)
         return $this;
     }
 
+    /**
+     * Откатывает транзакцию для указанных соединений с БД
+     * @param Connection[] $connections
+     * @return $this
+     */
+    protected function rollbackTransaction(array $connections)
+    {
+        foreach ($connections as $connection) {
+            $connection->rollBack();
+        }
+
+        return $this;
+    }
+
     /**
      * Фиксирует все начатые транзакции для указанных соединений с БД
      * @param Connection[] $connections