new syntax db(db.dog_id.belongs(db.dogs.owner=='james')).select(), thanks guruyaya

VERSION

@@ -1 +1 @@
-Version 1.99.4 (2012-02-09 11:15:33) stable
+Version 1.99.4 (2012-02-09 11:21:10) stable

gluon/dal.py

@@ -6914,6 +6914,8 @@ class Expression(object):
         return Query(self.db, op, self, value)
 
     def belongs(self, value):
+        if isinstance(value,Query):
+            value = self.db(value)._select(value.first._table._id)
         return Query(self.db, self.db._adapter.BELONGS, self, value)
 
     def startswith(self, value):