[Product-Developers] New style collections: migration, sub collections?

David Glick (Plone) david.glick at plone.org
Fri Nov 2 00:27:51 UTC 2012

On 11/1/12 10:29 AM, Maurits van Rees wrote:
> Hi,
> A few quick questions about the new style collections in Plone 4.2, to 
> check that I understand them correctly.
> Unless I have missed something, old style collections are not migrated 
> to new style when migrating to Plone 4.2.  Does someone have code that 
> would do that?  Perhaps an add-on that I missed? If not, then I might 
> want to create a package for that.

I'm not aware of existing code to do this, but it would be a nice thing 
to have. Perhaps it would make sense to add to plone.app.collection (as 
an optional thing) instead of a separate package?

> Sub collections are not possible in the new style.  I guess this is 
> because the UI and the logic can quickly get confusing and you do not 
> win much over creating a second, separate collection.


> I am guessing that creating a folderish version of the new style 
> collections should work though, allowing you to nest them.  Some logic 
> would be needed that looks for a parent collection and combine the two 
> queries.  That may not be good for Plone core, but are there technical 
> reasons why this would not be possible?

I'm not aware of technical reasons against it. I think the subcollection 
feature was removed mostly because it was confusing.

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