MooseX::AttributeHelpers(3p)

NAME
MooseX::AttributeHelpers - Extend your attribute interfaces

SYNOPSIS
  package MyClass;
  use Moose;
  use MooseX::AttributeHelpers;

  has 'mapping' => (
      metaclass => 'Collection::Hash',
      is        => 'rw',
      isa       => 'HashRef[Str]',
      default   => sub { {} },
      provides  => {
          exists    => 'exists_in_mapping',
          keys      => 'ids_in_mapping',
          get       => 'get_mapping',
          set       => 'set_mapping',
      },
      curries  => {
          set       => { set_quantity => [ 'quantity' ] }
      }
  );

  # ...

  my $obj = MyClass->new;
  $obj->set_quantity(10);      # quantity => 10
  $obj->set_mapping(4, 'foo'); # 4 => 'foo'
  $obj->set_mapping(5, 'bar'); # 5 => 'bar'
  $obj->set_mapping(6, 'baz'); # 6 => 'baz'

  # prints 'bar'
  print $obj->get_mapping(5) if $obj->exists_in_mapping(5);

  # prints '4, 5, 6'
  print join ', ', $obj->ids_in_mapping;

DESCRIPTION
While Moose attributes provide you with a way to name your accessors, readers, writers, clearers and predicates, this library provides commonly used attribute helper methods for more specific types of data.

As seen in the "SYNOPSIS", you specify the extension via the "metaclass" parameter. Available meta classes are:

PARAMETERS

  provides
This points to a hashref that uses "provider" for the keys and "method" for the values. The method will be added to the object itself and do what you want.

  curries
This points to a hashref that uses "provider" for the keys and has two choices for the value:

You can supply "{method => [ @args ]}" for the values. The method will be added to the object itself (always using @args as the beginning arguments).

Another approach to curry a method provider is to supply a coderef instead of an arrayref. The code ref takes $self, $body, and any additional arguments passed to the final method.

  # ...

  curries => {
      grep => {
          times_with_day => sub {
              my ($self, $body, $datetime) = @_;
              $body->($self, sub { $_->ymd eq $datetime->ymd });
          }
      }
  }

  # ...

  $obj->times_with_day(DateTime->now); # takes datetime argument, checks day

METHOD PROVIDERS

Number
    Common numerical operations.

String
    Common methods for string operations.

Counter
    Methods for incrementing and decrementing a counter attribute.

Bool
    Common methods for boolean values.

Collection::Hash
    Common methods for hash references.

Collection::ImmutableHash
    Common methods for inspecting hash references.

Collection::Array
    Common methods for array references.

Collection::List
    Common list methods for array references.

CAVEAT
This is an early release of this module. Right now it is in great need of documentation and tests in the test suite. However, we have used this module to great success at $work where it has been tested very thoroughly and deployed into a major production site.

I plan on getting better docs and tests in the next few releases, but until then please refer to the few tests we do have and feel free email and/or message me on irc.perl.org if you have any questions.

TODO
We need tests and docs badly.

BUGS
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.

AUTHOR
Stevan Little <stevan@iinteractive.com>

with contributions from:

Robert (rlb3) Boone

Paul (frodwith) Driver

Shawn (Sartak) Moore

Chris (perigrin) Prather

Robert (phaylon) Sedlacek

Tom (dec) Lanyon

Yuval Kogman

Jason May

Cory (gphat) Watson

Florian (rafl) Ragwitz

Evan Carroll

Jesse (doy) Luehrs

COPYRIGHT AND LICENSE
Copyright 2007-2009 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.