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MooseX::SlurpyConstructor - Make your object constructor collect all unknown attributes


version 1.30


    package My::Class;

    use Moose;
    use MooseX::SlurpyConstructor;

    has fixed => (
        is      => 'ro',

    has slurpy => (
        is      => 'ro',
        slurpy  => 1,

    package main;

        fixed => 100, unknown1 => "a", unknown2 => [ 1..3 ]

    # returns:
    #   $VAR1 = bless( {
    #       'slurpy' => {
    #           'unknown2' => [
    #               1,
    #               2,
    #               3
    #           ],
    #           'unknown1' => 'a'
    #       },
    #       'fixed' => 100
    #   }, 'ASDF' );


Including this module within Moose-based classes, and declaring an attribute as 'slurpy' will allow capturing of all unknown constructor arguments in the given attribute.

As of Moose 1.9900, this module can also be used in a role, in which case the constructor of the consuming class will become slurpy.


No additional options are added to your slurpy attribute, so if you want to make it read-only, or restrict its type constraint to a HashRef of specific types, you should state that yourself. Typical usage may include any or all of the options below:

    has slurpy => (
        is => 'ro',
        isa => 'HashRef',
        init_arg => undef,
        lazy => 1,
        default => sub { {} },
        traits => ['Hash'],
        handles => {
            slurpy_values => 'elements',

For more information on these options, see Moose::Manual::Attributes and Moose::Meta::Attribute::Native::Trait::Hash.



This module was originally written by Mark Morgan <>, with some bugfix patches by Christian Walde.

It was rewritten for Moose 2.0 by Karen Etheridge <>, drawing heavily on MooseX::StrictConstructor.


Thanks to the folks from the Moose mailing list and IRC channels for helping me find my way around some of the Moose bits I didn't know of before writing this module.


Bugs may be submitted through the RT bug tracker (or

There is also a mailing list available for users of this distribution, at

There is also an irc channel available for users of this distribution, at #moose on


  • Mark Morgan <>

  • Karen Etheridge <>


This software is copyright (c) 2009 by Karen Etheridge.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.