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rebuilding lazy Moose attributes

by jabowery (Beadle)
on Aug 20, 2013 at 18:10 UTC ( #1050219=perlquestion: print w/replies, xml ) Need Help??
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, );
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?

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Re: rebuilding lazy Moose attributes
by tobyink (Abbot) 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

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