MooseX::Storage::Traits::OnlyWhenBuilt - A custom trait to bypass serialization

    {   package Point;
        use Moose;
        use MooseX::Storage;

        with Storage( traits => [qw|OnlyWhenBuilt|] );

        has 'x' => (is => 'rw', lazy_build => 1 );
        has 'y' => (is => 'rw', lazy_build => 1 );
        has 'z' => (is => 'rw', builder => '_build_z' );

        sub _build_x { 3 }
        sub _build_y { expensive_computation() }
        sub _build_z { 3 }

    }

    my $p = Point->new( 'x' => 4 );

    # the result of ->pack will contain:
    # { x => 4, z => 3 }
    $p->pack;

Sometimes you don't want a particular attribute to be part of the serialization if it has not been built yet. If you invoke Storage() as outlined in the Synopsis, only attributes that have been built (ie, where the predicate returns 'true') will be serialized. This avoids any potentially expensive computations.

See the SYNOPSIS for a nice example that can be easily cargo-culted.

meta

All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT.

Stevan Little <stevan.little@iinteractive.com>

Copyright 2007-2008 by Infinity Interactive, Inc.

http://www.iinteractive.com

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.