Re: [Zope3-Users] Locatability of schema.Object field

[Tom Dossis]

Alen Stanisic wrote:
 Hi,
 
 in the following situation:
 
 class ISomeNames(IContained):
 
 items = List(... value_type=Object(schema=IName ..) )
 
 class IName(Interface):
 
 afield = Choice(... vocabulary=AVocabulary ..)
 
 say in the vocabulary I need to look up containment tree but IName
 object does not have enought context set so I assume schema.Object
 fields are not locatable.  Or I guess they could be, my understanding
 is that you could also point to an existing persistent object using
 schema.Object field, which is not really what I am trying to do here.
 I just want ISomeNames to be composed of list of IName objects.
 
 I have read a bit about contained proxies.  Is the solution here to
 wrap IName with this proxy and make it appear as if it is contained by
 the container of ISomeNames.  How would I do that?  Or is there a way
 to refer back to ISomeNames from IName?
 
 Also this thread touches on the subject of schema.Object locatability:
 
 http://mail.zope.org/pipermail/zope3-users/2006-December/005090.html

Hi Alen,
I wrote a descriptor for something like this...

http://yoma.svn.sourceforge.net/viewvc/yoma/yoma/trunk/site/property.py?view=markup

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[Zope3-Users] Locatability of schema.Object field

[Alen Stanisic]

Hi,

in the following situation:

class ISomeNames(IContained):

items = List(... value_type=Object(schema=IName ..) )

class IName(Interface):

afield = Choice(... vocabulary=AVocabulary ..)

say in the vocabulary I need to look up containment tree but IName
object does not have enought context set so I assume schema.Object
fields are not locatable.  Or I guess they could be, my understanding
is that you could also point to an existing persistent object using
schema.Object field, which is not really what I am trying to do here.
I just want ISomeNames to be composed of list of IName objects.

I have read a bit about contained proxies.  Is the solution here to
wrap IName with this proxy and make it appear as if it is contained by
the container of ISomeNames.  How would I do that?  Or is there a way
to refer back to ISomeNames from IName?

Also this thread touches on the subject of schema.Object locatability:

http://mail.zope.org/pipermail/zope3-users/2006-December/005090.html

Thanks in advance
Alen
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