On Thu, 2010-06-17 at 11:28 +0200, Wichert Akkerman wrote:
> I noticed something odd in repoze.folder: __setitem__ does not allow you 
> to replace an existing item. This is a result from __setitem__ being an 
> alias for add(). Is that a deliberate design decision? If not I'ld like 
> to change it to allow replacing items.

The folder API isn't meant to exactly mirror the dictionary API, so I
don't consider this odd.  Most CMS-ish UI operations that call for
adding a new item also call for aborting if an item by that name already
exists, so we default to that behavior.

But it probably doesn't matter much.  As long as the deletion sends (or
doesn't) the proper ObjectRemoved, etc events, I'd be sort of +0 on
being able to replace an existing item.  I think this would imply
changing .add rather than changing __setitem__.  Please read the
docstrings for .add and .remove before changing much; we need to retain
the ability to add and remove an item with and without sending events.
If we change things so doing an addition replaces, and if someone adds a
new item that already exists, .add should call .remove with the
send_events argument the same value as what was passed to .add.

- C

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