[Zope-dev] local index_html in ZClass instance

[Michel Pelletier]

Heiko Stoermer wrote:
> 
> Hi,
> 
> my folderish ZClass Product already contains an index_html document. I
> would like to provide users with a possibility to create a local
> index_html document in their instance of the product. but if I create a
> local index_html, I get a key error: "already in use".
> Is this a general ZClass problem?

No, it is by design.

ObjectManagers do not allow you to create an object contained in them
that allready uses that id, *or is allready an attribute (like a method)
of that ObjectManager*.

Your ZClass does not 'contain' a method object.  Rather, the method
object is a method of your ZClass.  The method managment view *looks*
like the container managment view, but it is a different beast.  methods
in the ZClass Methods view will become attributes of your ZClass
instances, *not* children in a containment relationshipsub-objects. 
When you try and create a sub-object of your object it gives you an
error because your objects (an instance of your ZClass) allready has an
attribute (a method) by that name.


> Is there a solution?

Have your ZClass's index_html method defer it's action until run-time:

<dtml-if FrontPage>
  <dtml-var FrontPage>
<dtml-else>
  <dtml-var myObscureDefaultContent>
</dtml-if>

Make 'myObscureDefaultContent' a method of your ZClass, this is what is
your index_html method of the ZClass now.  If the user creates a new
method in the ObjectManager called 'FrontPage', it will be displayed
instead.

-Michel
> 
> regards,
> Heiko
> 
> --
> heiko.stoermer@innominate.de
>                                                         innominate AG
>                                                      networkingpeople
> fon: +49.30.308806-0 fax: -77               web: http://innominate.de
> 
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