How to get something random in datastore (AppEngine)?

Question

Currently i\'m using something like this:

    images = Image.all()
    count = images.count()
    random_numb = random.randrange(1, count)
    image = Image.         


        

Answer 1

Another (less efficient) method, which requires no setup:

query = MyModel.all(keys_only=True)

# query.filter("...")

selected_key = None
n = 0
for key in query:
  if random.randint(0,n)==0:
    selected_key = key
  n += 1

# just in case the query is empty
if selected_key is None:
  entry = None
else:
  entry = MyModel.get(selected_key)