Alan,
I think we might have determined what was causing the problem with
your application. I think you are having this problem because you
overrode the __init__ method of your PolyModel in a way that we were
not expecting. Please see this thread:
http://groups.google.com/group/google-appengine/browse_thread/thread/c67228d9a1fc6859
We are working to fix the problem, but if you please, could you
check to see if this is what is causing the problem for your
application?
Here's how it's related to PolyModel. If you have attempted to copy
_app and _from_entity as positional parameters through your overridden
constructor, you would have been one positional parameter short. This
parameter is '_from_entity' which is used to tell the Model
constructor that it is loading from the datastore and can ignore
errors that occur when assigning to derived (read-only) properties.
Thanks for bringing this issue to our attention. Let me know if
there is anything else I can do to help.
- Rafe Kaplan
On Oct 13, 1:19 am, Alan Xing <[email protected]> wrote:
> We nailed down the problem to a third party package called 'appenginepatch'
> we use. This 'appenginepatch' seems not compatible with some GAE backend
> updates deployed on yesterday(Monday) afternoon.
> If any one of you has good patch solution on 'appenginepatch', could you
> please help share?
>
> Note: We actually resolved the 'Class-key is a derived property and cannot
> be set.' problem by some hack. But there are more problems with
> 'appenginepatch' after that.
>
> Thanks,
> Alan
>
>
>
> On Mon, Oct 12, 2009 at 11:15 PM, Alan Xing <[email protected]> wrote:
> > It is very clear this problem is with GAE poly model. All my
> > functionalities that touch any poly model objects are breaking. Anything
> > that don't touch is working fine.
> > We have been using poly model since day one. We haven't changed any poly
> > model class for a few weeks. We never had this problem before.
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