Am 22.01.2009, 17:46 Uhr, schrieb Jamie McQuay <ja...@scimatic.com>: > Hi, > > I'm using ZODB in a desktop app (i.e. not using zope). > > I have class A which contains a list of instances for class B. > > I can persist class A when the list of class B is empty. When i add > an instance of class B to the list (and set _p_changed = 1) i get the > error: > "TypeError: can't pickle PySwigObject objects" > > Can someone please give me a link of some advice in how i go about > persisting lists of class instances?
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It seems you used SWIG to create class B (or you use a library which provides B and the library uses SWIG). By default, instances of classes created by SWIG are not serializable. You'd get the same error if you tried import pickle pickle.dumps( B() ) So what you (or the library author) need to do is add one or more of the methods for serialization explained here: http://www.python.org/doc/2.5/lib/pickle-inst.html http://www.python.org/doc/2.5/lib/node321.html http://www.python.org/doc/2.5/lib/node322.html -Matthias _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
