Hello everybody, I needed to store some information about my users (I don't need to use Google accounts) and created a model called FbUser, each entity in the model is a fbuser and each fbuser has a unique user uid, a field I call 'uid'.
A uid can't appear more than once in the datastore but it could eventually change for a user, so it's not inmutable. It can't be used directly as a key_name because it always starts with a number, in fact is always a ten digit number. I want to make sure that I only store unique uid's in the datastore so I thought about Model.get_or_insert: http://code.google.com/appengine/docs/datastore/modelclass.html#Model_get_or_insert and found this suggestion by Dado (thanks a lot for it): http://groups.google.com/group/google-appengine/browse_thread/thread/9f956ebcc39dd80f/bf5bf1edd53a4410?lnk=gst&q=Model.get_or_insert#bf5bf1edd53a4410 I implemented it for my case like this: class FbUser(db.Model): """ You can then call FbUser.get_or_insert_by_uid('foo') and get back an FbUser instance with that unique identifier (it gets created if it does not yet exists).Model.get_or_insert is automatically wrapped in a transaction """ uid = db.StringProperty(required=True) @staticmethod def get_or_insert_by_uid(uid): # prefix with unique identifier to qualify and avoid beginning with digits, which datastore does not accept key_name = 'uid:'+uid return FbUser.get_or_insert(key_name, uid=uid) And then I can 'get or create' a fbuser with uid '123' using this: FbUser.get_or_insert_by_uid('123') I've tested and it works but I want to be sure if this is the right way of doing it. What do you think? Thanks! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com 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 -~----------~----~----~----~------~----~------~--~---
