rebuilding lazy Moose attributes

jabowery has asked for the wisdom of the Perl Monks concerning the following question:

A solution offered to the problem of change propagation in lazy Moose attributes was to use lazy_build => 1 in the lazy attribute and then, in the attributes referenced by the builder:

has 'attr1' => (
    ...
    trigger => \&clear_attr2, 
);
[download]

However, this requires maintaining back-references in the source code that could have been created along with the memoized value at build time. Is there a MooseX that does this automatically?

Comment on rebuilding lazy Moose attributes Select or Download Code

Replies are listed 'Best First'.
Re: rebuilding lazy Moose attributes by tobyink (Canon) on Aug 20, 2013 at 21:48 UTC
I tend to use 'ro' attributes as much as possible and thus avoid things like this. I have a module Trait::Attribute::Derived that offers a bunch of sugar for deriving one attribute from another, but it doesn't offer this feature. Perhaps it should? `package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name`	[reply]