GAE ndb design, performance and use of repeated properties

Question

Say I have a picture gallery and a picture could potentially have 100k+ fans. Which ndb design is more efficient?

class picture(ndb.model):
    fanIds = ndb.         


        

Answer 1

Do not use repeated properties if you have more than 100-1000 values. (1000 is probably already pushing it.) They weren't designed for such use.