Florent Guillaume wrote:
            base._p_changed=0


Marks the object not changed, to allow ghostifying.

            base._p_deactivate()

Ghostifies the object.

            base.__setstate__(state)

Updates the object's dict directly. This really shouldn't be called on a
ghost object, I believe it's illegal but not checked. I'm not sure what
happens anyway.

Right, that's what I figured too, and I'm guessing ZODB now does "the right thing", which breaks history copy because history copy has this bug ;-)

  base._p_activate()       # make sure we're not a ghost

Ah cool, never new that existed...

  base.__setstate__(state) # change the state
  base._p_changed = True   # marke object as dirty

The "scrubbing" is not necessary, it's done by the __setstate__ C
implementation of Persistent.

Okay, in that case we can loose everything funky before the __setstate__ call, right? How sure are you that __setstate__ will override everything? I see that Evan specifically added the code to do the scrubbing in revision 20478, sadly he didn't write tests or explain why it was necessary :-S

You don't need any transactions to at least test this sequence, only the
Persistent base class and a dummy connection can be involved.

Hmmm, this smells like deep fu of which I am not capable ;-)
Are there any examples of this?

To really test the history yes of course you'll need a full database. Many
tests do that.

Oh, do you know of any examples I can look at?

cheers,

Chris

--
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           - http://www.simplistix.co.uk
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