[Zope3-Users] Re: looking for something like getUtilitiesFor...

Chris Withers chris at simplistix.co.uk
Tue Sep 19 03:02:56 EDT 2006

Philipp von Weitershausen wrote:
> Utilities are never created when they're looked up. They're created when 
> registered. Singletons (instances) are registered with the utility 
> registry, never factories.

Ah, yes, of course, I think I'm looking for local utilities...

>> and all I'm then doing with the list is generating a drop-down for 
>> people to select from...
> getUtilitiesFor is all we have. If you want that drop-down, consider 
> using UtilityVocabulary from zope.app.component.vocabulary, e.g.:
>  class FooUtilityNames(UtilityVocabulary):
>      interface = IFoo
>      nameOnly = True
>      classProvides(IVocabularyFactory)
> Register that as a utility:
>   <utility component="...FooUtilityNames" name="Foo Utilities"/>
> Then you can refer to it from a schema definition (Choice field).

Hmm, okay, how have the UI's for the creation of local utilities been 
built? (I'm thinking there must be some kind of drop-down somewhere with 
an "Add list" as in Zope 2's ZMI, and that must include the available 
types of local utility?)

Also, more theoretically, would you see indexes for a catalog as being 
local utilities. If not, what would you see them as being?



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            - http://www.simplistix.co.uk

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