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and 142 contributors-
Stevan Little
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Dave Rolsky
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Jesse Luehrs
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Shawn M Moore
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יובל קוג'מן (Yuval Kogman)
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Florian Ragwitz
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Hans Dieter Pearcey
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- NAME
- VERSION
- SYNOPSIS
- DESCRIPTION
- THE METACLASS TRAIT
- RECIPE CAVEAT
- SEE ALSO
- AUTHORS
- COPYRIGHT AND LICENSE
NAME
Moose::Cookbook::Meta::Table_MetaclassTrait - Adding a "table" attribute as a metaclass trait
VERSION
version 2.2201
SYNOPSIS
# in lib/MyApp/Meta/Class/Trait/HasTable.pm package MyApp::Meta::Class::Trait::HasTable; use Moose::Role; Moose::Util::meta_class_alias('HasTable'); has table => ( is => 'rw', isa => 'Str', ); # in lib/MyApp/User.pm package MyApp::User; use Moose -traits => 'HasTable'; __PACKAGE__->meta->table('User');
DESCRIPTION
In this recipe, we'll create a class metaclass trait which has a "table" attribute. This trait is for classes associated with a DBMS table, as one might do for an ORM.
In this example, the table name is just a string, but in a real ORM the table might be an object describing the table.
THE METACLASS TRAIT
This really is as simple as the recipe "SYNOPSIS" shows. The trick is getting your classes to use this metaclass, and providing some sort of sugar for declaring the table. This is covered in Moose::Cookbook::Extending::Debugging_BaseClassRole, which shows how to make a module like
Moose.pm
itself, with sugar likehas_table()
.Using this Metaclass Trait in Practice
Accessing this new
table
attribute is quite simple. Given a class namedMyApp::User
, we could simply write the following:my $table = MyApp::User->meta->table;
As long as
MyApp::User
has arranged to apply theMyApp::Meta::Class::Trait::HasTable
to its metaclass, this method call just works. If we want to be more careful, we can check that the class metaclass object has atable
method:$table = MyApp::User->meta->table if MyApp::User->meta->can('table');
In theory, this is not entirely correct, since the metaclass might be getting its
table
method from a different trait. In practice, you are unlikely to encounter this sort of problem.RECIPE CAVEAT
This recipe doesn't work when you paste it all into a single file. This is because the
use Moose -traits => 'HasTable';
line ends up being executed before thetable
attribute is defined.When the two packages are separate files, this just works.
SEE ALSO
Moose::Cookbook::Meta::Labeled_AttributeTrait - Labels implemented via attribute traits =pod
AUTHORS
Stevan Little <stevan@cpan.org>
Dave Rolsky <autarch@urth.org>
Jesse Luehrs <doy@cpan.org>
Shawn M Moore <sartak@cpan.org>
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
Karen Etheridge <ether@cpan.org>
Florian Ragwitz <rafl@debian.org>
Hans Dieter Pearcey <hdp@cpan.org>
Chris Prather <chris@prather.org>
Matt S Trout <mstrout@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2006 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.
Module Install Instructions
To install Moose, copy and paste the appropriate command in to your terminal.
cpanm Moose
perl -MCPAN -e shell install Moose
For more information on module installation, please visit the detailed CPAN module installation guide.