Re: [Openinteract-help] Set methods

[Chris W. <ch...@cw...>]

On Jan 22, 2004, at 5:19 PM, Vsevolod (Simon) Ilyushchenko wrote:
> A minor annoyance - the generated mutator methods do not assign the 
> undef value to attributes. Sometimes it's a desired behavior. It would 
> be cool if this could be turned on or off via a configuration option.

I actually did think of this one -- in the docs for SPOPS.pm is the 
following:

----------
You should use the hash interface to get and set values in your object
-- it is easier. However, SPOPS will also create an
accessor/mutator/clearing-mutator for you on demand -- just call a
method with the same name as one of your properties and two methods
('${fieldname}' and '${fieldname}_clear') will be created. Similar to
other libraries in Perl (e.g., L<Class::Accessor|Class::Accessor>) the
accessor and mutator share a method, with the mutator only being used
if you pass a defined value as the second argument:

  ...

  # This won't do what you want (clear the field value)...
  $object->fieldname( undef );

  # ... but this will
  $object->fieldname_clear;
----------

So you should be able to call $object->foo_clear and assign 'foo' undef.

Chris

--
Chris Winters
Creating enterprise-capable snack systems since 1988