On Jul 19, 2007, at 10:36 AM, Roger Ineichen wrote:
Hi Tobias
Auftrag von Gary Poster
Gesendet: Donnerstag, 19. Juli 2007 15:53
An: Tobias Rodäbel
[...]
zope.app.keyreference-3.5.0_dev_r77018-py2.4.egg requires
ZODB3>=3.9.0-dev-r77011
But there might be a caching problem within ZODB3-3.9.0 dev
r77011,
my debug session tells:
/development/Zope3/MyProject/eggs/ZODB3-3.9.0_dev_r77011-py2.4-
macosx-10.4-ppc.egg/ZODB/Connection.py(644)_store_objects()
-> raise
(Pdb) obj
<zope.app.file.image.Image object at 0x3faadb0>
(Pdb) oid
'\x00\x00\x00\x00\x00\x00\x00\xc6'
(Pdb) self._cache[oid]
*** KeyError: '\x00\x00\x00\x00\x00\x00\x00\xc6'
(Pdb) self._cache[oid] = obj
*** TypeError: Cache values must be persistent objects.
But zope.app.file.image.Image should be persistent.
[...]
Looking forward to some hints or help,
Hi Tobias. The ZODB 3.9 dev version is only different from 3.8 in
some conflict resolution code, for which I am responsible. Some
thoughts.
I'm pretty shure you ve got a LocationProxy arround your object
because the zope.app.file doesn't implement ILocation.
Hey Roger. I bet you are right.
...
Gary
-----
This happens because of the call in
ZODB.Connection.py
$Id: Connection.py 75693 2007-05-11 22:18:37Z jim $
cool that we have the revision info in the file header ;-)
line: 627
except:
# Dang, I bet it's wrapped:
# TODO: Deprecate, then remove, this.
if hasattr(obj, 'aq_base'):
self._cache[oid] = obj.aq_base
else:
raise
My question is, can we improve the method:
if hasattr(obj, 'aq_base')
and remove the proxy with a method that works?
I mentioned this to Jim. If the masking of the original exception
doesn't appear to lose any useful information, he'd prefer something
like
if type(obj) is not obj.__class__:
raise ValueError('object appears to be proxied', obj)
else:
raise
IOW, don't guess, but give a more helpful error message
Gary_______________________________________________
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