/ 
MooseX-Traits-0.13
River stage three • 23 direct dependents • 165 total dependents
/ MooseX::Traits

NAME

MooseX::Traits - Automatically apply roles at object creation time

VERSION

version 0.13

SYNOPSIS

Given some roles:

package Role;
use Moose::Role;
has foo => ( is => 'ro', isa => 'Int' required => 1 );

And a class:

package Class;
use Moose;
with 'MooseX::Traits';

Apply the roles to the class at new time:

my $class = Class->with_traits('Role')->new( foo => 42 );

Then use your customized class:

$class->isa('Class'); # true
$class->does('Role'); # true
$class->foo; # 42

DESCRIPTION

Often you want to create components that can be added to a class arbitrarily. This module makes it easy for the end user to use these components. Instead of requiring the user to create a named class with the desired roles applied, or apply roles to the instance one-by-one, he can just create a new class from yours with with_traits, and then instantiate that.

There is also new_with_traits, which exists for compatibility reasons. It accepts a traits parameter, creates a new class with those traits, and then instantiates it.

Class->new_with_traits( traits => [qw/Foo Bar/], foo => 42, bar => 1 )

returns exactly the same object as

Class->with_traits(qw/Foo Bar/)->new( foo => 42, bar => 1 )

would. But you can also store the result of with_traits, and call other methods:

my $c = Class->with_traits(qw/Foo Bar/);
$c->new( foo => 42 );
$c->whatever( foo => 1234 );

And so on.

METHODS

$class->with_traits( @traits )

Return a new class with the traits applied. Use like:

$class->new_with_traits(%args, traits => \@traits)

new_with_traits can also take a hashref, e.g.:

my $instance = $class->new_with_traits({ traits => \@traits, foo => 'bar' });

ATTRIBUTES YOUR CLASS GETS

This role will add the following attributes to the consuming class.

_trait_namespace

You can override the value of this attribute with default to automatically prepend a namespace to the supplied traits. (This can be overridden by prefixing the trait name with +.)

Example:

package Another::Trait;
use Moose::Role;
has 'bar' => (
    is       => 'ro',
    isa      => 'Str',
    required => 1,
);

package Another::Class;
use Moose;
with 'MooseX::Traits';
has '+_trait_namespace' => ( default => 'Another' );

my $instance = Another::Class->new_with_traits(
    traits => ['Trait'], # "Another::Trait", not "Trait"
    bar    => 'bar',
);
$instance->does('Trait')          # false
$instance->does('Another::Trait') # true

my $instance2 = Another::Class->new_with_traits(
    traits => ['+Trait'], # "Trait", not "Another::Trait"
);
$instance2->does('Trait')          # true
$instance2->does('Another::Trait') # false

AUTHOR

Jonathan Rockway <jrockway@cpan.org>

CONTRIBUTORS

  • Karen Etheridge <ether@cpan.org>

  • Florian Ragwitz <rafl@debian.org>

  • Tomas Doran <bobtfish@bobtfish.net>

  • Hans Dieter Pearcey <hdp@weftsoar.net>

  • Rafael Kitover <rkitover@cpan.org>

  • Stevan Little <stevan.little@iinteractive.com>

  • Alexander Hartmaier <abraxxa@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2008 by Infinity Interactive, Inc. http://www.iinteractive.com.

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