> b1 = B(key_name='andy', parent=db.get(parent)) Only works if parent is the key of an entity that exists. (My original "parent=parent" would have worked if parent had been the key of an actual entity.)
I'm trying to create a B whose parent does not exist as described in: http://code.google.com/appengine/docs/datastore/keysandentitygroups.html "You can create an entity with an ancestor path without first creating the parent entity. To do so, you create a Key for the ancestor using a kind and key name, then use it as the parent of the new entity. All entities with the same root ancestor belong to the same entity group, whether or not the root of the path represents an actual entity." On Nov 16, 1:53 am, "Jesaja Everling" <[EMAIL PROTECTED]> wrote: > Hi Andy! > > I'm not sure, but doesn't the parent argument in this line > > # parent is a db.Key so why does the next line fail? > b1 = B(key_name='andy', parent=parent) > > has to be an actual entity rather than a key value? > The error message seems to suggest so. > > So you should probably able to achieve what you want by using: > > b1 = B(key_name='andy', parent=db.get(parent)) > > Best Regards, > > Jesaja Everling > > 2008/11/16 Andy Freeman <[EMAIL PROTECTED]>: > > > > > > > > > Inhttp://code.google.com/appengine/docs/datastore/keysandentitygroups.html > > > "You can create an entity with an ancestor path without first creating > > the parent entity. To do so, you create a Key for the ancestor using a > > kind and key name, then use it as the parent of the new entity. All > > entities with the same root ancestor belong to the same entity group, > > whether or not the root of the path represents an actual entity." > > > From the Model discussion in > >http://code.google.com/appengine/docs/datastore/modelclass.html > > > "parent > > The Model instance or Key instance for the entity that is the new > > entity's parent." > > > class A(db.Model): > > pass > > > class B(db.Model): > > pass > > > parent = db.Key.from_path('A', 'hh') > > > # parent is a db.Key so why does the next line fail? > > b1 = B(key_name='andy', parent=parent) > > > C:\Program Files\Google\google_appengine_1.1.5\google\appengine\ext\db > > \__init__.py in __init__(self=<schema.B object at 0x01AB5970>, > > parent=datastore_types.Key.from_path('A', u'hh', _app=u'imagestew'), > > key_name='andy', _app=None, **kwds={}) > > > type 'exceptions.TypeError'>: Expected Model type; received > > aglpbWFnZXN0ZXdyCQsSAUEiAmhoDA (is Key) > > args = ('Expected Model type; received > > aglpbWFnZXN0ZXdyCQsSAUEiAmhoDA (is Key)',) > > message = 'Expected Model type; received > > aglpbWFnZXN0ZXdyCQsSAUEiAmhoDA (is Key)' > > -- > o > L_/ > OL > This is Schäuble. Copy Schäuble into your signature to help him on his > way to Überwachungsstaat.- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
