Bulk operation via a smart cache (proof of concept)

do_add_friend.py

from pymacaron.auth import get_userid

# Implements an hypothetical endpoint that let's a user (identified by a JWT token)
# add another user as friend (identified by its user ID in the data object received
# as parameter, mapping to the POST request's body)

def do_add_friend(data):

    viewer_id = get_userid()   # Extract the ID of the current user from its JWT auth token
    friend_id = data.user_id   # And 'user_id' in the POST request is the friend's ID
    
    # Use a smart cache object that fetches both profiles in one single
    # bulk get call:
    cache = ObjectCache()
    cache.fetch_missing_objects(viwer_id, friend_id)
    
    viewer = cache.get_object(viewer_id)
    friend = cache.get_object(friend_id)
    
    # do some stuff....
    viewer.add_friend(friend)
    
    # And a saver objects, that keeps a queue of objects to bulk insert into Datastore.
    saver = ObjectSaver(cache=cache)
    saver.put_object(viewer)
    saver.commit()