[Zope] Re: have problem with managing objects within a external product

[Tres Seaver]

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Allen Huang wrote:

> I found out what my problem is.
> in my code I please baseclass Item before Folder
>  class ShpProjectClass(Item, Folder, Persistent, Implicit, CatalogAware):
> when I change the order, it worked normally
>  class ShpProjectClass(Folder, Item, Persistent, Implicit, CatalogAware):
> but I don't understand why? could someone explain this to me?

Because 'Item' implements the "containerish" methods as no-ops:  it
isn't intended to be anything other than a "leaf" object.  Moving
'Folder' to the front means you are using *its* implmenetations of the
containerish methods, instead.


Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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