[Zope-Coders] Re: [ANN] Proposed Features for Zope 2.7: OrderedObjectManager

[Yuppie]

Shane Hathaway wrote:
> The larger burden is that Zope developers will come to rely on the new 
> API, which will then be taken away for Zope 3.  It seems to me that a 
> better course of action is to require Zope developers to specify that 
> they need a folderish object that retains order and has the order 
> maintenance API.  That way Zope developers insulate themselves from the 
> effects of a pending change.

Ok. One point for your score ;)

That argument makes me reconsider my position. You are right. We need a 
migration plan. And I have no clear vision for the migration to Zope3.

I thought it could work like this: Zope2 Folders will become Zope3 
OrderedFolders, Zope2 BTreeFolders will become Zope3 Folders.

But for a smooth migration there should perhaps be a solution like this:

- Adding a new class OrderedFolder (or what ever the name should be) to 
Zope 2.7 with an API that also will be implemented in Zope3.

- Adding a deprecation warning to methods of Zope 2.7 Folders that are 
not continued in Zope3 Folders.
With a message like this: "Method xxx is deprecated for Folders. Please 
switch to OrderedFolder if you need this method in the long run."


What do you think?


Cheers,

Yuppie