I have a simple inheritance hierarchy of classes of objects that I have stored in my datastore. I wish to fetch these objects from the datastore using get_by_id(), and this works fine if I know the exact class of the object that I am about to fetch. However, I would like to be able to fetch using a parent class, and be able to get object of any subclass. Unfortunately, the datastore does not seem to know about the class inheritance of these objects.
For example: class Entry(db.Model): title = db.StringProperty(required=True) class BinaryEntry(Entry): content = db.BlobProperty(required=True) class TextEntry(Entry): content = db.TextProperty(required=True) If I have a TextEntry in the datastore with an id of 1, this works: entry = TextEntry.get_by_id(1) but this does not: entry = Entry.get_by_id(1) Is there any simple way, without using the Expando model, that I can do this? Note that I do not have the Key of the object I wish to fetch, only the ID, and since I would need the Kind in order to create the Key from the ID with db.Key.from_path(), I can't do a generic db.get(key) either. Thanks for any help, Craig --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---