I was getting the same error. It turns out that after 1.3.1 (presumably), the function from_entity (which gets called after a fetch) in google/appengine/ext/db/__init__.py executes this line:
instance = cls(None, _from_entity=True, **entity_values) which calls the constructor of your entity. In my case, as with Toru, the constructor would auto-generate a keyname if none was given... but if the query is based on keys, then we get this BadArgumentError. I don't know why the SDK is trying to (re-?)create my entities. The way I patched this was to find all points in my code where I would create entities without providing a keyname and modify them so I would provide a keyname by manually calling the generator function. In my case it looked something like this: entity = cls(key_name=cls.key_name_generator(**kwds), **kwds) Hope this helps, Alexandros On Feb 11, 5:00 am, Toru Tomita <[email protected]> wrote: > Yes, Me too, > > I get same problem. > > 1.3.1 current production env in /base/python_lib/versions/1/google/ > appengine/ext/db/__init__.py in __init__ raises the error > > 672: if key_name and key_name != key.name(): > 673: raise BadArgumentError('Cannot use key and key_name at the > same time' > 674: ' with different values') > > but 1.3.0 was like this > > if key_name is not None: > raise BadArgumentError('Cannot use key and key_name at the same > time') > > My app uses OpenID GAE, and > ------------- > class Session(db.Expando): > # the logged in person > person = db.ReferenceProperty(Person) > > # OpenID library session stuff > openid_stuff = db.TextProperty() > > def __init__(self, parent=None, key_name=None, **kw): > """if key_name is None, generate a random key_name so that > session_id cookies are not guessable > """ > if key_name is None: > import uuid > key_name = uuid.uuid4() > import binascii > key_name = binascii.unhexlify(key_name.hex) > import base64 > key_name = "S" + base64.urlsafe_b64encode(key_name).rstrip('=') > super(db.Expando, self).__init__(parent=parent, key_name=key_name, > **kw) <<-----here raise the error > ------------ > > I cannot solve the problem.... > > On Feb 10, 6:04 am, Tonny <[email protected]> wrote: > > > I'm getting this error this morning (CET) > > > "Cannot use key and key_name at the same time with different values" > > > The error happens when an Entity is loaded from the store. > > > The app worked fine until recently (unfortunately I do not have an > > exact time, since it's a non default verison which is not visited > > every day. > > > We haven't made any updates since the last time we saw it working, so > > what's changed? > > > I noticed the server version says 1.3.1 in the log, but the latest > > stable download is 1.3.0 - i that correct? > > > Regards > > Tonny > > -- 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.
