No it doesn't. I deployed application using belongs in GAE, because it worked for me with python sdk for appengine using dev_appserver.py
But it didn't when I upload it to appengine. I lost two days wondering. Nothing is logged on appengine logs. Then I changed it to manually selecting each element in the list (using reduce() and map() ) and then site started to work. So, what I understood is it's not working. I'm using Web2py Version 1.91.6 (2011-01-04 15:55:30) google_appengine sdk: release: "1.4.1"