Thanks Nick. That library looks terrific.
However, I notice that it primarily uses: from google.appengine.api import datastore for accessing the appengine datastore, where as most of the documentation at: http://code.google.com/appengine/docs/python/datastore/ uses: from google.appengine.ext import db I'm having trouble finding good documentation on google.appengine.api.datastore, can someone point me in the right direction? Thanks! Josh On Oct 5, 6:46 am, "Nick Johnson (Google)" <[email protected]> wrote: > Hi Josh, > You might want to look into the 'ranklist' library. It'll allow you to keep > a large (much larger than 1000) set of records in ranked order, and > efficiently answer queries like 'what is the value of the 235th entry?' and > 'where would a score of 500 place me?'. > > http://code.google.com/p/google-app-engine-ranklist/ > > -Nick Johnson > > > > > > On Fri, Oct 2, 2009 at 10:40 PM, Josh <[email protected]> wrote: > > > Hi all, > > > I've seen a number of interesting discussions on how to do efficient > > pagination on appengine, but one thing that I haven't seen addressed, > > which I would like, is how to efficiently compute ranking information > > for the items that are paginated. > > > Let me motivate this discussion by considering a leader board. We > > have a model like so: > > > class Player(db.Model): > > name = db.StringProperty() > > score = db.IntegerProperty() > > last_updated = db.DateTimeProperty(auto_now=True) > > > We may have hundreds of thousands of Players and we want to be able to > > rank them by their score. > > > How could we used the previously discussed pagination techniques > > (http://code.google.com/appengine/articles/paging.html) to efficiently > > page through the leader board and not only show the Players in order > > by score, but also assign a rank value to each player. > > > Many thanks for your thoughts and input. > > > Cheers, > > Josh > > -- > Nick Johnson, Developer Programs Engineer, App Engine > Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: > 368047 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
