New subject: [Zope] Need some help to get rid of an InvalidObjectReference exception

20 Aug 2008

      --- On Wed, 8/20/08, chaouche yacine <yacinechaouche@yahoo.com> wrote:
...
From: chaouche yacine <yacinechaouche@yahoo.com>
Subject: Re: [Zope] Need some help to get rid of an InvalidObjectReference exception
To: "Dieter Maurer" <dieter@handshake.de>
Cc: zope@zope.org
Date: Wednesday, August 20, 2008, 3:22 AM
--- On Tue, 8/19/08, Dieter Maurer
<dieter@handshake.de> wrote:
...
From: Dieter Maurer <dieter@handshake.de>
Subject: Re: [Zope] Need some help to get rid of an
InvalidObjectReference exception
To: yacinechaouche@yahoo.com
Cc: zope@zope.org
Date: Tuesday, August 19, 2008, 11:16 AM
chaouche yacine wrote at 2008-8-18 09:50 -0700:
...
Need some help to get rid of an
InvalidObjectReference
exception
In my zope product, when I try to put some
specific
object in the session, I get this :
2008-08-18T14:51:02 ERROR(200) SiteError
http://www.afdas.com:8091/noyauafdas/tests/testAdresses
...
...
Traceback (most recent call last):
 File
"/opt/Zope-2.7/lib/python/ZPublisher/Publish.py",
...
line 107, in publish
...
transactions_manager.commit()
 File
"/opt/Zope-2.7/lib/python/Zope/App/startup.py",
...
line 222, in commit
...
get_transaction().commit()
 File
"/opt/Zope-2.7/lib/python/ZODB/Transaction.py",
...
line 241, in commit
...
ncommitted += self._commit_objects(objects)
 File
"/opt/Zope-2.7/lib/python/ZODB/Transaction.py",
...
line 356, in _commit_objects
...
jar.commit(o, self)
 File
"/opt/Zope-2.7/lib/python/ZODB/Connection.py",
...
line 452, in commit
...
dump(state)
InvalidObjectReference: Attempt to store an object
from
a foreign database connection
A given persistent object can only be in one (ZODB-)
database, not in several
databases at the same time.
You must copy the persistent object, when you want it
to be
stored
(also) in another (ZODB-) database.
You can use the "_getCopy(destination)"
method to
create such
a copy. "_getCopy" is defined by
"OFS.CopySupport.CopySource" inherited
by most Zope objects.
-- 
Dieter
I narrowed the code to what is necessary to fire this
exception, and here is the tarball for those who want to
test it live
http://yacinechaouche.googlepages.com/InvalidObjectReferenceExample.tgz
This is the directory contents :
+ InvalidObjectReferenceExample 
\_ __init__.py
\_ NonZODBObject.py
\_+ zmi
  \_ ZODBLivingObjectAddForm.pt
\_ ZODBLivingObject.py
================
NonZODBObject.py
================
class NonZODBObject:
    """
    Hello, i do not live in the ZODB
    """
def __init__(self,p_context):
        """
        """
  # This is the evil line. 
        self.context = p_context
===================
ZODBLivingObject.py
===================
from OFS.SimpleItem import SimpleItem
from NonZODBObject import NonZODBObject
class ZODBLivingObject(SimpleItem) :
    """
    Hello, I live in the ZODB.
    """
    meta_type = "ZODBish"
    def __init__(self):
        """
        """
        self.id = "ZODBish"
        self.title = "ZODBish"
def breakEverything(self):
        """
        """
        nonZODBish = NonZODBObject(self)
        # This line breaks everything.
self.REQUEST.SESSION.set('breakish',nonZODBish)
        # This can be seen in the console if runzope
        print "it's me",nonZODBish.context
        return nonZODBish.context
__init__.py contains the code necessary to create a ZODBish
in the ZODB through the ZMI
zmi contains the form that adds a ZODBish through the ZMI
As you see, I do not intentionally copy objects from one
ZODB to another... Except maybe if the session has a
separate storage and that this breaks everything. But then,
I could not even use the _getCopy method because nonZODBish
do not have a _p_jar attribute.
Any help or comment would be appreciated .
No, I got it all wrong, it is much simpler than that : I cannot put any ZODB living object into the session, be it a python script, a page template, anything... this is not product specific.

So the question is now : is there another way to put some ZODB objects in the session for future use ? because there is no reason to create the same object twice or thrice in my product so I want it to stay in the session.

Thanks.

Re: [Zope] Need some help to get rid of an InvalidObjectReference exception

chaouche yacine

Andrew Milton

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