[Zope] ZCatalog: searching for all results that *don't* match

[Jean Jordaan]

Hi Toby

> If you know all possible status values:
> 
> catalog( Status = ['outstanding','cancelled','anything else']
>        , meta_type = 'Reminder'
>        )

Thanks! Currently, the Status is either 'dismissed' or nothing,
so for me that means::

  catalog( Status = ['']
         , meta_type = 'Reminder'
         )

which works! :)  I'd already tried the following, which did not 
work::

  catalog( Status = ''
         , meta_type = 'Reminder'
         )

It returns all reminders. One other possibility I'd thought of
is to give the Reminder ZClass an 'isDismissed' method, which
does 'return Status == "dismissed"', and index that. But that
seems rather heavy for something this simple. I'm going with the 
'Status = ['']' idiom for now.

Regards,
Jean Jordaan