[Zope] CMFBTreeFolder Behavior

[David Pratt]

This is very helpful.  Thank you Paul.  I will give this a go and let 
you know how it works out.  Overall, if I can get this to work for me, 
it will also reduce RAM consumption on the server - a much better 
solution than trying to handle everything in a batch process. :-)

Regards
David

On Monday, February 28, 2005, at 01:56 PM, Paul Winkler wrote:

> On Mon, Feb 28, 2005 at 12:28:15PM -0400, David Pratt wrote:
>> Hi Paul. Thank you for your reply.  I think you are right on what is
>> happening with BTree and will try what you have suggested.  I was just
>> going to try looping over the data but thought of this as strange and
>> should consult the list.  I think the workflow approach to the problem
>> is likely the better one for sure since I already have the logic for
>> what I want to do with each image.  Can this approach work on images 
>> on
>> the uploads folder only without affecting the behavior of images 
>> across
>> the entire portal?
>
> The workflow will apply to all images, but:
>
>> For example, if I set a boolean property on the
>> uploads folder and tested for it
>
> That should do the trick. Use that as your guard condition
> for the automatic transition.
>
> It occurs to me that the workflow will basically keep
> trying that guard condition for all Portal Images in your site
> and won't stop until they leave their initial state.
> There might be performance implications there :-)
> There's ways around this, assuming that performance testing
> reveals it is a problem (which should not be assumed).
>
> One way would be to add another state to your workflow,
> let's call it NewImageState or something. Set this state to be the 
> default
> initial state. Have only one transition from it - the automatic
> transition we discussed. If the image is in the Uploads folder,
> the automatic transition calls your processing script and
> deletes the image, aborting the transition.
> Otherwise, the transition's target state is whatever your
> old initial state was (e.g. "private").
> This way, the transition is called exactly once.
>
> Note I have not tested this; deleting the object in
> the middle of the transition strikes me as a bit funky -
> it might "just work" or not.
> Maybe this should be done as the transition's "before" script.
>
>> I will look for the DCWorkflow docs in the meantime. Many thanks.
>
> First hit on google:
> http://www.zope.org/Members/hathawsh/DCWorkflow_docs
> They're old but AFAIK still accurate.
>
> THere's also a good chapter in Andy McKay's Plone book,
> but IIRC it doesn't cover automatic transitions.
>
> -- 
>
> Paul Winkler
> http://www.slinkp.com
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