/usr/lib/perl5/Moose/Cookbook/Meta/Recipe5.pod is in libmoose-perl 2.0401-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | package Moose::Cookbook::Meta::Recipe5;
# ABSTRACT: The "table" attribute as a metaclass trait
=pod
=head1 NAME
Moose::Cookbook::Meta::Recipe5 - The "table" attribute as a metaclass trait
=head1 VERSION
version 2.0401
=head1 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');
=head1 DESCRIPTION
This recipe takes the metaclass table attribute from
L<Moose::Cookbook::Meta::Recipe4> and implements it as a metaclass
trait. Traits are just roles, as we saw in
L<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.
=head2 Using this Metaclass Trait in Practice
Once this trait has been applied to a metaclass, it looks exactly like
the example we saw in L<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 C<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 C<table> method from a I<different> role. In practice, you
are unlikely to encounter this sort of problem.
=head1 SEE ALSO
L<Moose::Cookbook::Meta::Recipe3> - Labels implemented via attribute
traits
L<Moose::Cookbook::Meta::Recipe4> - Adding a "table" attribute to the
metaclass
=head1 AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See L<Moose/CABAL> and L<Moose/CONTRIBUTORS> for details.
=head1 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.
=cut
__END__
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