[Zope] - What constitutes a transaction?

[Scott Robertson]

On Sun, 13 Dec 1998, Ty Sarna wrote:

> I'm obviosuly missing something here.
> 
> I have a product, a subclass of Folder.  It has several methods that do
> things to its internal state.  Some of these methods cause a transacton
> to be generated (Ie, when adding or deleting objects, setting
> properties, etc., the method shows up in Undo).  When I shut down zope
> and restart it, these changes are still there. My added methods have
> effect that is forgotten at shutdown, and they don't show up in the Undo
> list. I have another Product where my added methods do work correctly.
> 
> What am I missing?
> 
It sounds like your using a mutable (Is this the right term?) like a list
or a dictionary to store your properties. You'll need to call the
__change__() method with a value of true to notify the storage routines
that this objects needs to be changed. 

So for example do something like this.

class Spam:
  def __init__(self)
    self.eggs={}

  def add(self,id, value)
   self.eggs[id] = value
   self.__changed__(1)


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