Re: [Zope] TypeError: Cache values must be persistent objects.
Nikko Wolf wrote at 2005-6-21 15:08 -0600:
I'm trying to develop a filesystem-based Product (here 'ABCD') and
unless I remove the ABCD folder from my Products directory, I get the
following error IN THE MANAGEMENT INTERFACE.
Is it possible to determine what's causing the problem? After multiple
restarts, I did a global Find in the ZMI and (I think) deleted all
objects of type ABCD Content. But still the problem persists (no pun
intended).
...
self._cache[oid] = object
TypeError: Cache values must be persistent objects.
Looks as if you had changed the class structure:
An object that formerly was persistent (when it was stored
in the ZODB) now gets a class which is no longer
derived from Persistence.
Note that the ZODB identifies the class of an object
by modulepath, classname. You should ensure
that the class identified in this way always derives
from Persistence (and that is exists).
To find out what object this is, you catch the error and
look at object.__class__.
...
Module ZODB.Connection, line 227, in _persistent_load
- __traceback_info__: ('\x00\x00\x00\x00\x00\x009^',
('Products.ABCD.XML_File', 'XML_File'))
TypeError: Cache values must be persistent objects.
As we see, catching is not necessary.
The traceback is enough ;-)
Products.ABCD.XML_File lost its Persistence inheritance...
--
Dieter
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Re: [Zope] TypeError: Cache values must be persistent objects.
Nikko Wolf wrote at 2005-6-21 16:13 -0600: ... But that begs the questions + why didn't the stack backtrace give the problem ID? It would not have helped: the problem was not an individual instance but a class problem... Your problem is of a rather rare type (few people remove Persistence from the inheritance chain for persistent objects). In general (not in your special case), the id cannot be determined in case of loading problems. More importantly: The error was detected in ZODB, a component used by Zope but also externally. And ZODB cannot expect all its persistent objects to have an id (indeed most, even in Zope, do not!). + if 0x28b5 can be deciphered as an ID, how? Neither this nor your original message tells us what the 0x28b5 should be ;-) It probably is the object's oid (object id), in hexadecimal form. It is useful, to load the object from ZODB in an interactive Python interpreter to analyse the problem more easily (i.e. use pdb.pm to analyse all objects relevant for the exception). + why didn't the Find locate the broken instance? (it *might* be since I've created about 15 different portal_types, and the ABCD Content wasn't really what the offending ID was). Because, it would have died (same exception as reported in your original message) when it had tried to access the object. Do not expect to get realiable results when you did something that prevents objects to be loaded from ZODB ;-) + is this a common problem with file-system (or ZClass) products? Few people remove Persistence from the inheritance chain of a class once they have stored persistent objects of this class in the ZODB... -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
[Zope] TypeError: Cache values must be persistent objects.
Help!
I'm trying to develop a filesystem-based Product (here 'ABCD') and
unless I remove the ABCD folder from my Products directory, I get the
following error IN THE MANAGEMENT INTERFACE.
Is it possible to determine what's causing the problem? After multiple
restarts, I did a global Find in the ZMI and (I think) deleted all
objects of type ABCD Content. But still the problem persists (no pun
intended).
Gaah! How can I fix this?
= event.log contains ==
2005-06-21T14:57:17 ERROR(200) ZODB Couldn't load state for 0x28b5
Traceback (most recent call last):
File /usr/local/zope/lib/python/ZODB/Connection.py, line 600, in
setstate
self._set_ghost_state(obj, p)
File /usr/local/zope/lib/python/ZODB/Connection.py, line 639, in
_set_ghost_state
state = unpickler.load()
File /usr/local/zope/lib/python/ZODB/Connection.py, line 227, in
_persistent_load
self._cache[oid] = object
TypeError: Cache values must be persistent objects.
== FROM THE =
Traceback (innermost last):
Module ZPublisher.Publish, line 101, in publish
Module ZPublisher.mapply, line 88, in mapply
Module ZPublisher.Publish, line 39, in call_object
Module Shared.DC.Scripts.Bindings, line 306, in __call__
Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
Module App.special_dtml, line 175, in _exec
Module DocumentTemplate.DT_Let, line 76, in render
Module DocumentTemplate.DT_In, line 643, in renderwob
Module DocumentTemplate.DT_In, line 771, in sort_sequence
Module ZODB.Connection, line 600, in setstate
Module ZODB.Connection, line 639, in _set_ghost_state
Module ZODB.Connection, line 227, in _persistent_load
- __traceback_info__: ('\x00\x00\x00\x00\x00\x009^',
('Products.ABCD.XML_File', 'XML_File'))
TypeError: Cache values must be persistent objects.
=
Plone version: 2.0.5
Zope version: (Zope 2.7.6-final, python 2.3.4, linux2)
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