Question

I’m using Google App Engine with NDB. I’ve removed a lot of code for brevity, but kept the basic problem. I’m getting an error 'list' object has no attribute 'get_result'

def get_future(keys):
    future = ndb.get_multi_async(keys)
    important_value = ... # get important value
    return {"future" : future, "value" : important_value}

dic = get_future(keys)
future = dic['future']
# error `'list' object has no attribute 'get_result'`
items = future.get_result()

Why am I getting a list back when I should be getting a future?

Answer 1

get_multi_async actually returns a list of future objects, so you would need to call .get_result() on those objects.

Official definition:

ndb.get_multi_async(keys, **ctx_options)

Asynchronously fetches entities identified by the passed sequence of keys.

Arguments

keys
 -Sequence of keys

**ctx_options 
 -Context options 

Returns a list of Future objects. Each future’s result is a Model instance or None if the key wasn’t found.