Added support for recursive embedded documents

mongoengine/base.py

@@ -204,6 +204,9 @@ class DocumentMetaclass(type):
         exc = subclass_exception('MultipleObjectsReturned', base_excs, module)
         new_class.add_to_class('MultipleObjectsReturned', exc)
     
+        global _document_registry
+        _document_registry[name] = new_class
+
         return new_class
         
     def add_to_class(self, name, value):
@@ -216,8 +219,6 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
     """
 
     def __new__(cls, name, bases, attrs):
-        global _document_registry
-
         super_new = super(TopLevelDocumentMetaclass, cls).__new__
         # Classes defined in this package are abstract and should not have 
         # their own metadata with DB collection, etc.
@@ -322,8 +323,6 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
             new_class._fields['id'] = ObjectIdField(db_field='_id')
             new_class.id = new_class._fields['id']
 
-        _document_registry[name] = new_class
-
         return new_class