osx man page for moose::cookbook::meta::recipe5

Moose::Cookbook::Meta::Recipe5(3)			User Contributed Perl Documentation			 Moose::Cookbook::Meta::Recipe5(3)

NAME
       Moose::Cookbook::Meta::Recipe5 - The "table" attribute as a metaclass trait

VERSION
       version 2.0205

SYNOPSIS
	 package MyApp::Meta::Class::Trait::HasTable;
	 use Moose::Role;

	 has table => (
	     is  => 'rw',
	     isa => 'Str',
	 );

	 package Moose::Meta::Class::Custom::Trait::HasTable;
	 sub register_implementation { 'MyApp::Meta::Class::Trait::HasTable' }

	 package MyApp::User;
	 use Moose -traits => 'HasTable';

	 __PACKAGE__->meta->table('User');

DESCRIPTION
       This recipe takes the metaclass table attribute from Moose::Cookbook::Meta::Recipe4 and implements it as a metaclass trait. Traits are just
       roles, as we saw in Moose::Cookbook::Meta::Recipe3.

       The advantage of using traits is that it's easy to combine multiple traits, whereas combining multiple metaclass subclasses requires
       creating yet another subclass. With traits, Moose takes care of applying them to your metaclass.

   Using this Metaclass Trait in Practice
       Once this trait has been applied to a metaclass, it looks exactly like the example we saw in Moose::Cookbook::Meta::Recipe4:

	 my $table = MyApp::User->meta->table;

	 # the safe version
	 $table = MyApp::User->meta->table
	     if MyApp::User->meta->meta->can('does')
		and MyApp::User->meta->meta->does('MyApp::Meta::Class');

       The safe version is a little complicated. We have to check that the metaclass object's metaclass has a "does" method, in which case we can
       ask if the the metaclass does a given role.

       It's simpler to just write:

	 $table = MyApp::User->meta->table
	     if MyApp::User->meta->can('table');

       In theory, this is a little less correct, since the metaclass might be getting its "table" method from a different role. In practice, you
       are unlikely to encounter this sort of problem.

SEE ALSO
       Moose::Cookbook::Meta::Recipe3 - Labels implemented via attribute traits

       Moose::Cookbook::Meta::Recipe4 - Adding a "table" attribute to the metaclass

AUTHOR
       Stevan Little <stevan@iinteractive.com>

COPYRIGHT AND LICENSE
       This software is copyright (c) 2011 by Infinity Interactive, Inc..

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

perl v5.12.5							    2011-09-06					 Moose::Cookbook::Meta::Recipe5(3)