database - Google App Engine - ndb sorting by string? (Python) -

is possible sort query results stringproperty?

i have following:

class user(ndb.model):      first_name = ndb.stringproperty(indexed=false)      last_name = ndb.stringproperty(indexed=false)

now if want retrieve stored entries database, use (it works):

user_query = user.query(ancestor=user_key(user_name))

but want result ordered first_name, use this:

user_query = user.query(ancestor=user_key(user_name)).order(-user.first_name)

this not work! don't know wrong , not produce errors, no results show anymore. empty table :-(

you need index order work.

Live