From 53d66b72673550efa9316acd097c4dc8275a8346 Mon Sep 17 00:00:00 2001
From: Michael Henson <hensom@gmail.com>
Date: Thu, 27 Jan 2011 23:51:10 -0500
Subject: [PATCH] Added QuerySet.clone() to support copying querysets

---
 mongoengine/queryset.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mongoengine/queryset.py b/mongoengine/queryset.py
index 519dda03..5d48e6ef 100644
--- a/mongoengine/queryset.py
+++ b/mongoengine/queryset.py
@@ -293,6 +293,20 @@ class QuerySet(object):
         self._cursor_obj = None
         self._limit = None
         self._skip = None
+        
+    def clone(self):
+      """Creates a copy of the current :class:`~mongoengine.queryset.QuerySet`"""
+      c = self.__class__(self._document, self._collection_obj)
+      
+      copy_props = ('_initial_query', '_query_obj', '_where_clause',
+                    '_loaded_fields', '_ordering', '_snapshot',
+                    '_timeout', '_limit', '_skip')
+                    
+      for prop in copy_props:
+        val = getattr(self, prop)
+        setattr(c, prop, copy.deepcopy(val))
+        
+      return c
 
     @property
     def _query(self):