Merge branch 'patch' of github.com:neolooong/mongoengine into neolooong-patch

Author: bagerard

mongoengine/base/datastructures.py

@@ -113,7 +113,10 @@ def __init__(self, list_items, instance, name):
         BaseDocument = _import_class("BaseDocument")
 
         if isinstance(instance, BaseDocument):
-            self._instance = weakref.proxy(instance)
+            if isinstance(instance, weakref.ProxyTypes):
+                self._instance = instance
+            else:
+                self._instance = weakref.proxy(instance)
         self._name = name
         super().__init__(list_items)
 
@@ -188,7 +191,10 @@ def _mark_as_changed(self, key=None):
 class EmbeddedDocumentList(BaseList):
     def __init__(self, list_items, instance, name):
         super().__init__(list_items, instance, name)
-        self._instance = instance
+        if isinstance(instance, weakref.ProxyTypes):
+            self._instance = instance
+        else:
+            self._instance = weakref.proxy(instance)
 
     @classmethod
     def __match_all(cls, embedded_doc, kwargs):