Sounds like you are trying to persist a class attribute value. This is not possible because instance are persistent, not classes. This is also the reason that the values change over all the instances. You are changing a mutable attribute of the class in place. I would suggest setting the value in the constructor of your objects, to make sure it is an instance attribute rather than a class attr. This: class foo: def __init__(self): self.alist = [] def append(self ,v) self.alist.append(v) # changes instance attr self._p_changed = 1 # will work Instead of: class foo: alist = [] def append(self ,v) self.alist.append(v) # changes class(!) attr self._p_changed = 1 # Will not work, the instance was not changed! hth, Casey On Wednesday 18 September 2002 03:27 pm, Arndt Droullier wrote:

Hello, I´m working on a product which contains custom data in a list of multiple dictionaries. How can I save the list/dictionaries after changes? Persistence is enabled (and works for other types), and "_p_changed" is set, also get_transaction().commit() is called.

A second problem is that multiple instances of the product reference the same list. So if I change the list of one of the instances the other changes, too. The list and dictionaries are stored in a class variable(in the product) and not global.

Thanks, Arndt.

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