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+.\" ========================================================================
+.\"
+.IX Title "Moose::Cookbook::Meta::Recipe5 3"
+.TH Moose::Cookbook::Meta::Recipe5 3 "2009-03-14" "perl v5.8.7" "User Contributed Perl Documentation"
+.SH "NAME"
+Moose::Cookbook::Meta::Recipe5 \- The "table" attribute as a metaclass trait
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 2
+\& package MyApp::Meta::Class::Trait::HasTable;
+\& use Moose::Role;
+.Ve
+.PP
+.Vb 4
+\& has table => (
+\& is => 'rw',
+\& isa => 'Str',
+\& );
+.Ve
+.PP
+.Vb 2
+\& package Moose::Meta::Class::Custom::Trait::HasTable;
+\& sub register_implementation { 'MyApp::Meta::Class::Trait::HasTable' }
+.Ve
+.PP
+.Vb 2
+\& package MyApp::User;
+\& use Moose \-traits => 'HasTable';
+.Ve
+.PP
+.Vb 1
+\& __PACKAGE__\->meta\->table('User');
+.Ve
+.SH "DESCRIPTION"
+.IX Header "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.
+.PP
+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.
+.Sh "Using this Metaclass Trait in Practice"
+.IX Subsection "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:
+.PP
+.Vb 1
+\& my $table = MyApp::User\->meta\->table;
+.Ve
+.PP
+.Vb 4
+\& # the safe version
+\& $table = MyApp::User\->meta\->table
+\& if MyApp::User\->meta\->meta\->can('does')
+\& and MyApp::User\->meta\->meta\->does('MyApp::Meta::Class');
+.Ve
+.PP
+The safe version is a little complicated. We have to check that the
+metaclass object's metaclass has a \f(CW\*(C`does\*(C'\fR method, in which case we
+can ask if the the metaclass does a given role.
+.PP
+It's simpler to just write:
+.PP
+.Vb 2
+\& $table = MyApp::User\->meta\->table
+\& if MyApp::User\->meta\->can('table');
+.Ve
+.PP
+In theory, this is a little less correct, since the metaclass might be
+getting its \f(CW\*(C`table\*(C'\fR method from a \fIdifferent\fR role. In practice, you
+are unlikely to encounter this sort of problem.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+Moose::Cookbook::Meta::Recipe3 \- Labels implemented via attribute
+traits
+.PP
+Moose::Cookbook::Meta::Recipe4 \- Adding a \*(L"table\*(R" attribute to the
+metaclass
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Dave Rolsky <autarch@urth.org>
+.SH "COPYRIGHT AND LICENSE"
+.IX Header "COPYRIGHT AND LICENSE"
+Copyright 2006\-2009 by Infinity Interactive, Inc.
+.PP
+<http://www.iinteractive.com>
+.PP
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
projects / catagits/Gitalist.git / blobdiff