Try to recommend, and catch NoSuchUserException. If you have no data at all for a user, there's no way to make recommendations since you know nothing about the user at all. However in this case you typically "recommend" a selection of most popular items to start.
2010/7/23 Matthias Böhmer <[email protected]>: > Hello, > > how can I find out, if a userID is already available inside a > DataModel? I am trying to find out if the rating data of a user is > already known within a data model, that is updated periodically. If > the user is not available inside the data model, I then want do treat > him as an anonymous user. And: how can I give recommendations to a > new, i.e. anonymous, user if I have no values for preferences. I think > the API requires me to set preferences. > > Best regards, > Matthias >
