[Zope3-dev] Re: registering nameless utilities

[Garrett Smith]

Jim Fulton wrote:

> Garrett Smith wrote:
> 
>> I want to lookup a utility using:
>>
>>   zapi.getUtility(iface)
>>
>> When I try to register a local utility with a site manager, the UI 
>> insists I provide a name. (The 'name' attribute of 
>> IUtilityRegistration is required.)
> 
> 
> This is undoubtably due to the fact that the schema system, unfotunately,
> can't tell the differene between an empty string and one that hasn't been
> provided, even when the minimum string length is 0.

Ah yes, this debate :-)

If this truly is a three-state value (!= '', '', and None), we'll need a 
different widget as a text field can only convey two states.

When it comes to registering utilities, is there a practical difference 
between '' and None? I would think we could use one or the other to 
indicate a 'nameless' utility.

  -- Garrett