Dearest Monks, I am attempting to build a class Foo that has an array of Bars. I would like a given Bar to be able to report, weakly, the Foos that it finds itself in. 
{

    package Foo;
    use Moose;
    use namespace::autoclean;

    has 'bars' => (
        traits  => ['Array'],
        is      => 'ro',
        isa     => 'ArrayRef[Bar]',
        default => sub { [] },
        handles => {
            push_bars   => 'push',
            all_bars    => 'elements',
        },
        lazy => 1,
    );

    sub BUILD {
        my $self = shift;
        $_->push_foos($self) foreach $self->all_bars;
    }

    __PACKAGE__->meta->make_immutable;

    1;
}

{

    package Bar;
    use Moose;
    use namespace::autoclean;

    has 'foos' => (
        traits  => ['Array'],
        is      => 'ro',
        isa     => 'ArrayRef[Foo]',
        default => sub { [] },
        handles => {
            push_foos   => 'push',
            all_foos    => 'elements',
        },
        lazy => 1,
    );

    __PACKAGE__->meta->make_immutable;

    1;
}

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From Moose and arrays of objects, adding weak_ref => 1 to the foos attribute in Bar is not the way to go. Is there a stable, reasonable way to do so or should I work up another solution?

In reply to Arrays of circular memory references by docdurdee

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