[ZODB-Dev] AdaptableStorage and ZClass instances

[Rocky Burt]

Well, my whole reason for doing is because we're going to be using Zope
in combination with Oracle8i due to a clients data requirements.

So I'll actually end up using the SQL mapping instead of the FS one.  But
I figured the unpickling problems would be present there also.

Unfortunately, I'm fairly new to the fascinating world of zope.  I'm going to
keep debugging this, but I guess I'm going to first give myself a crash
course in pickling.

I'm going to be using AdaptableStorage in combination with SAPDB (free
rdmbs), Oracle8i, Sybase, and MS SQLServer.  Can you point me at the code
that is postgresql specific in the SQL mapping so that I can abstract this?

- Rocky


> --------- Original Message ---------
> From: Shane Hathaway [mailto:shane@zope.com]
> Sent: February 12, 2003 10:15:49 -0500
> To: rocky.burt@bricsnet.com, zodb-dev@zope.org
> Subject: Re: [ZODB-Dev] AdaptableStorage and ZClass instances
> 
> 
> Rocky Burt wrote:
> > Not sure where AdaptableStorage questions/comments should go, but someone 
> > suggested this list, so here goes.
> > 
> > Starting off, I'd like to mention that the default FS mapping doesn't
> > allow you to create objects with ID's that start with '.' do to the
> > metadata prefix mapping.  I've quietly modifed my own FSConnection to use
> > '.__metadata__' as the prefix instead of '.' which works ok, but of course
> > I couldn't create a new object with an ID that starts with '__metadata__'.
> 
> Starting in version 0.5, you can configure that without changing the 
> code.  Use the metadata_prefix and hidden_filenames options when 
> creating the storage.
> 
> > (note: I couldn't create a plone site on a AS mount point because Plone 
> > creates items that start with '.'.  But now it works fine.)
> > 
> > But, my real issue is that it seems I can't paste in objects that are derived
> > from ZClasses.  When I try, I get the following error:
> > Traceback (innermost last):
> >   Module ZPublisher.Publish, line 98, in publish
> >   Module ZPublisher.mapply, line 88, in mapply
> >   Module ZPublisher.Publish, line 39, in call_object
> >   Module OFS.CopySupport, line 159, in manage_pasteObjects
> >   Module Products.AdaptableStorage.patches, line 58, in _getCopy
> >   Module Products.AdaptableStorage.zodb.utils, line 45, in copyOf
> > ImportError: No module named *toMgfZwMlJlaeWGbeSiFQw==
> > 
> > After some debugging, this seems to be a unpickling error.  Anyone have
> > any suggestions to fix or work pass this?
> 
> I haven't tried ZClass instances with AS yet.  You're fortunate you got 
> that far. :-)  I guess the copyOf() function needs to know about custom 
> class loaders.  My inclination is to say we should set the find_global 
> handler of the unpickler.
> 
> Shane
> 

-- 
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Rocky Burt
Development, Director

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