Moose triggers & method modifiers

[Robert Freimuth via moose]

I've been learning Moose and I came across unexpected behavior: method modifiers (such as 'after') do not seem to work with attribute triggers. This is an issue because I want a subclass to extend a method that is defined as a trigger in the parent. The issue and one workaround is shown below.

use strict;

use warnings;

package Foo;

use Moose;

has 'attrib' => ( is => 'rw', trigger => \&attrib_changed );

has 'workaround' => ( is => 'rw', trigger => \&workaround_changed );

sub attrib_changed

{

    print "  in attrib_changed\n"; # called

}

after 'attrib_changed' => sub

{

    print "    in 'after' attrib_changed\n"; # not called

};

sub workaround_changed

{

    my ( $self ) = @_;

    print "  in workaround_changed\n"; # called

    $self->not_a_trigger;

}

after 'workaround_changed' => sub

{

    print "    in 'after' workaround_changed\n"; # not called

};

sub not_a_trigger

{

    print "  in not_a_trigger\n"; # called

}

after 'not_a_trigger' => sub

{

    print "    in 'after' not_a_trigger\n"; # called

};

my $foo = Foo->new;

print "Calling attrib( 1 ):\n";

$foo->attrib( 1 );

print "Calling workaround( 1 ):\n";

$foo->workaround( 1 );

Output:

Calling attrib( 1 ):

  in attrib_changed

Calling workaround( 1 ):

  in workaround_changed

  in not_a_trigger

    in 'after' not_a_trigger

I could not find anything in the Moose docs or online that documents this behavior as a known limitation. I'd be surprised if I were the first one to notice it, so it makes me wonder whether I am trying to do something that is best done some other way. Thoughts?