experiment with mongodb and belongs

VERSION

@@ -1 +1 @@
-Version 2.7.4-stable+timestamp.2013.11.17.09.31.13
+Version 2.7.4-stable+timestamp.2013.11.17.12.02.33

gluon/dal.py

@@ -5578,6 +5578,9 @@ class MongoDBAdapter(NoSQLAdapter):
             value = obj
         else:
             value = NoSQLAdapter.represent(self, obj, fieldtype)
+        if isinstance(obj, (list, tuple)) and \
+                (not fieldtype == "json" or fieldtype.startswith('list:')):
+            return value
         # reference types must be convert to ObjectID
         if fieldtype  =='date':
             if value == None: