[Zope] Copying Objects of a Python Class

[Thomas Guettler]

Hi!

If I copy an instance of a python class (I am developing a python product)
I got the problem that it does a deep copy. The original
has a attribute called default_catalog which is
a reference to the catalog where all objects are stored.

If I do a copy, there is a unfortunately
a new object (default_catalog). But it should be a reference
to the catalog where all objects are stored.

I store a template in the folder 'defaults' and want
to copy it to 'documents'. (Layout: root/defaults root/documents)

In the Object which gets copied:
   def createNewDocument(self, REQUEST=None):
         r=self.root()
         orig=r.defaults[self.id]
         copy=orig._getCopy(r)

         # Stolen form CopySupport.manage_clone. Don't know what it does
         copy=copy.__of__(orig)

         copy.id=r.nextID()
         copy.isDefaultDocument=0
         r.documents._setObject(copy.id, copy) # TODO: Btree
         if copy.default_catalog!=orig.default_catalog:
             print "orig", orig.default_catalog
             print "copy", copy.default_catalog
             raise "Bad Copy"
         if REQUEST:
             REQUEST.RESPONSE.redirect('/' + r.id + '/documents/' + copy.id)

The log:
orig <ZCatalog instance at 02633AB8>
copy <ZCatalog instance at 02522EC0>
--> there is a new object

_getCopy does this (From Zope's CopySupport.py):
     def _getCopy(self, container):
         # Ask an object for a new copy of itself.
         f=tempfile.TemporaryFile()
         self._p_jar.exportFile(self._p_oid,f)
         f.seek(0)
         ob=container._p_jar.importFile(f)
         f.close()
         return ob

I think the export and reimport creates new objects.

I think I will write my own copy method and don't use _getCopy except
someone has a solution

Thank you for listening.

  thomas