[Zope] Persistent dictionaries

[Michael R. Bernstein]

On Thu, 2001-08-23 at 17:54, Thomas Olsen wrote:
>
> and my derived classes look something like this:
> 
> ---snip--------------------------------------------
> class TextElement(AbstractElement):
>     """
>     text element.
>     """
>     meta_type = 'Text Element'
> 
>     def __init__(self, id):
>         self.id = id
>         self._attributes = {'value':'','html':'','alignment':''}
> 
>     def edit(self, value, html, alignment):
>         """ Update the properties """
>         self._attributes['alignment'] = str(alignment)
>         self._attributes['value'] = str(value)
>         self._attributes['html'] = utils._format_stx(self.value)
> ---snip--------------------------------------------
> 
> It works great - until the object gets unloaded from the memory :-(
> 
> What am I doing wrong?

Unless I miss my guess, this is because Zope doesn't persist changes to
mutable subobjects automatically. Dictionaries (like lists) are mutable
types, so you need to inform the persistence machinery that something
has changed:

self.__changed__(1)

Immutable properties, such as strings or tuples, don't have this
requirement.

HTH,

Michael Bernstein.