Merge pull request #1088 from touilleMan/bug-1058

Fix DictField with '_cls' field is converted to Document on access

mongoengine/fields.py

@@ -794,6 +794,7 @@ class DictField(ComplexBaseField):
 
     def __init__(self, basecls=None, field=None, *args, **kwargs):
         self.field = field
+        self._auto_dereference = False
         self.basecls = basecls or BaseField
         if not issubclass(self.basecls, BaseField):
             self.error('DictField only accepts dict values')