[BlueBream] bluebream Digest, Vol 9, Issue 4

[Jonah Crawford]

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Thanks Thierry,

I'm assuming that root = getParents(context)[-2] in your example below would traverse to a persistent folder with the terms a client adds to it.

Also are you saying that Vocabularies remember or persist their context so that it does not need to be passed one when it is called ?

Thanks again!

Jonah

On Sep 5, 2010, at 9:00 AM, bluebream-request at zope.org wrote:



> Hi,
> 
> I think you should better use a vocabulary to define such a dynamic
> list of values, as a vocabulary can be dynamic and have a context.
> 
> Something like that:
> 
>  from zope.dublincore.interfaces import IZopeDublinCore as IDC
>  from zope.schema.vocabulary import SimpleTerm, SimpleVocabulary
> 
>  class GroupsVocabulary(SimpleVocabulary):
> 
>    classProvides(IVocabularyFactory)
> 
>    def __init__(self, context):
>      root = getParents(context)[-2]
>      terms = [SimpleTerm(name,name,title)
>               for name,title in ((zapi.getName(item),IDC(item).title)
>                                  for item in root.values())]
>      super(GroupsVocabulary,self).__init__(terms)
> 
> Registering is done like that in ZCML:
> 
>  <utility
>    name="groupids"
>    component=".GroupsVocabulary" />
> 
> or in Python code in the same way ; and the interface is modified as
> follow:
> 
>  class INeedTheGroupListing(IContainer):
>    groups = List(value_type=Choice(title=u'Client generated groups',
>                                    vocabulary='groupids'),
>                  required=True)
> 
> 
> Hope this helps,
> Thierry

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