-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Paul Smith wrote:
Hi,
We've been playing with the FSDump product (http://www.zope.org/Members/tseaver/FSDump) over the last few days, and all appears to be working fine, except for exporting ZClass based objects.
The 'offending' part of the Dumper.py script appears to be:
def _dumpZClass( self, obj, path=None ): # Dump properties of obj (assumed to be a ZClass) to the # filesystem as a directory, including propertysheets and # methods, as well as any nested ZClasses. if path is None: path = '' path = os.path.join( path, obj.id ) file = self._createMetadataFile( path, '' ) file.write( 'title:string=%s\n' % obj.title )
### only getting this far as _zclass_ causes attribute error
file.write( 'metatype:string=%s\n' % obj._zclass_.meta_type ) file.write( 'bases:tokens=%s\n' % ','.join( map( lambda klass: str(klass), obj._zbases ) ) ) file.write( 'class_id:int=%s\n' % obj._zclass_.__module__ ) file.close()
I've indicated within the code snippet above that when parsing ZClass objects, it's only working to the point where it's successfully written out the title to the .metadata file, but then fails. We put in some debug logging, which reveals:
exceptions.AttributeError _zclass_[('zope/Products/FSDump/Dumper.py', 158, '_dumpObject', 'handler( object, path )'), ('zope/Products/FSDump/Dumper.py', 454, '_dumpZClass', "file.write( 'metatype:string=%s\\n' % obj._zclass_.meta_type )")])
which suggests _zclass_ is an attribute not available on our objects.
These are fairly basic ZClass objects for news items, and I've tried creating several additional test Products to try and determine what is required to get this to work, but to no avail.
If anyone has any pointers as to what needs doing to get FSDump to dump out ZClass objects, I'd be more than happy to hear suggestions!
Hmmm, I don't recall for sure, but I *think* the dumper is expecting to dump the actual ZClass (as in '/Control_Panel/YourProduct/YourClass'), rather than instances made from it. The '_zclass_' attribute is not found on the instances. I *think* you need to write your own dumper function, and "register" it (via monkey-patch) into Products.FSDump.Dumper.Dumper._handlers for the meta_type of your instances. E.g., in a filesystem product (or ExternalMethod):: - -------------------------- 8< --------------------------- def _dumpMyZClassInstances(dumper, object, path): """ Create a file or files on the filesystem """ def initialize(context): # could be the ExternalMethod, too from Products.FSDump.Dumper import Dumper handler_overrides = {'My ZClass' : _dumpMyZClassInstances, # register others here } Dumper._handlers.update(handler_overrides) - -------------------------- 8< --------------------------- Tres. - -- =================================================================== Tres Seaver +1 202-558-7113 tseaver@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFC/LSi+gerLs4ltQ4RAjV0AJ9f/DGN9Ux0xJ8NiK1kvxvuUxG3jACdEE8l 1d2YeXPaIzSuAWzEUndGM2c= =BLTZ -----END PGP SIGNATURE-----