NAME

       Moose::Cookbook::Legacy::Table_ClassMetaclass - Adding a "table" attribute to the
       metaclass

VERSION

       version 2.2009

SYNOPSIS

         package MyApp::Meta::Class;
         use Moose;
         extends 'Moose::Meta::Class';

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

DESCRIPTION

       WARNING: Subclassing metaclasses (as opposed to providing metaclass traits) is strongly
       discouraged. This recipe is provided solely for reference when encountering older code
       that does this.

       In this recipe, we'll create a new metaclass which has a "table" attribute. This metaclass
       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

       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::Recipe2, which shows how to make a module like
       "Moose.pm" itself, with sugar like "has_table()".

   Using this Metaclass in Practice
       Accessing this new "table" attribute is quite simple. Given a class named "MyApp::User",
       we could simply write the following:

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

       As long as "MyApp::User" has arranged to use "MyApp::Meta::Class" as its metaclass, this
       method call just works. If we want to be more careful, we can check the metaclass's class:

         $table = MyApp::User->meta->table
             if MyApp::User->meta->isa('MyApp::Meta::Class');

CONCLUSION

       Creating custom metaclass is trivial. Using it is a little harder, and is covered in other
       recipes. We will also talk about applying traits to a class metaclass, which is a more
       flexible and cooperative implementation.

SEE ALSO

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

       Moose::Cookbook::Extending::Recipe2 - Acting like Moose.pm and providing sugar Moose-style

AUTHORS

       •   Stevan Little <stevan.little@iinteractive.com>

       •   Dave Rolsky <autarch@urth.org>

       •   Jesse Luehrs <doy@tozt.net>

       •   Shawn M Moore <code@sartak.org>

       •   יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>

       •   Karen Etheridge <ether@cpan.org>

       •   Florian Ragwitz <rafl@debian.org>

       •   Hans Dieter Pearcey <hdp@weftsoar.net>

       •   Chris Prather <chris@prather.org>

       •   Matt S Trout <mst@shadowcat.co.uk>

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.

perl v5.26.1                                201Moose::Cookbook::Legacy::Table_ClassMetaclass(3pm)