[snowy] Support latest-sync-revision in User API handler.

[Sanford Armstrong <sharm src gnome org>]

commit f57baf219001d9f138bec5b4e793ed7f3cadffe1
Author: Sandy Armstrong <sanfordarmstrong gmail com>
Date:   Sun May 17 20:49:44 2009 -0700

    Support latest-sync-revision in User API handler.
    
    It might be better (would reduce queries) to add this field to the User model.
---
 api/handlers.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/api/handlers.py b/api/handlers.py
index 11743f6..a1657c0 100644
--- a/api/handlers.py
+++ b/api/handlers.py
@@ -19,6 +19,7 @@ from django.core.exceptions import ObjectDoesNotExist
 from django.core.urlresolvers import reverse
 from django.contrib.auth.models import User
 from django.db import transaction
+from django.db.models import Max
 
 from piston.handler import AnonymousBaseHandler, BaseHandler
 from piston.utils import rc, HttpStatusCode
@@ -59,6 +60,7 @@ class UserHandler(AnonymousBaseHandler):
                 'api-ref': reverse('note_api_index', kwargs=reverse_args),
                 'href': reverse('note_index', kwargs=reverse_args),
             },
+            'latest-sync-revision' : Note.objects.filter(author=user).aggregate(Max('last_sync_rev'))['last_sync_rev__max']
             # TODO: friends
         }