[Zope] Persisting a dictionary as a object property

[Andy McKay]

Thanks that worked like a charm!

----- Original Message -----
From: "Martijn Pieters" <mj@digicool.com>
To: "Andy McKay" <AndyM@activestate.com>
Cc: <zope@zope.org>
Sent: Wednesday, July 05, 2000 5:21 PM
Subject: Re: [Zope] Persisting a dictionary as a object property


> On Wed, Jul 05, 2000 at 04:52:44PM -0700, Andy McKay wrote:
> > Ok so I have an object, I have many properties persisting on the object
> > using the wonderful PropertyManager. But I want to persist a dictionary.
> > This isn't an option for the PropertyManager. I added a dictionary into
the
> > object just by adding the line: _map = {}
>
> You will have to let the persistance machinery know that you changed the
> dictionary. A dictionary is a mutable object, and persistance can only
track
> inmutable objects automatically. See the ZODB docs:
>
>
http://www.zope.org/Documentation/Developer/Models/ZODB/ZODB_Persistent_Obje
cts_Persistent_Doc.html
>
> (http://www.zope.org/Documentation/Developer/Models/ZODB for the framed
set,
> choose Persitent Objects, then Persitent in the bottom-left frame).
>
> You should either treat the dictionary as immutable:
>
>   data = self._map
>   data.append(foo)
>   self._map = data
>
> or set a special flag to let the ZODB know the objetc has changed:
>
>   self._map.append(foo)
>   self._p_changed = 1
>
> You could also replace the dictionary by a PersitentMapping instance. See
> above docs for more info.
>
> --
> Martijn Pieters
> | Software Engineer            mailto:mj@digicool.com
> | Digital Creations          http://www.digicool.com/
> | Creators of Zope               http://www.zope.org/
> | ZopeStudio: http://www.zope.org/Products/ZopeStudio
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>
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