Moose::Cookbook::Legacy::Table_ClassMetaclass - phpMan

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

VERSION
    version 2.2200

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 AT cpan.org>

    *   Dave Rolsky <autarch AT urth.org>

    *   Jesse Luehrs <doy AT cpan.org>

    *   Shawn M Moore <sartak AT cpan.org>

    *   יובל קוג'מן (Yuval Kogman) <nothingmuch AT woobling.org>

    *   Karen Etheridge <ether AT cpan.org>

    *   Florian Ragwitz <rafl AT debian.org>

    *   Hans Dieter Pearcey <hdp AT cpan.org>

    *   Chris Prather <chris AT prather.org>

    *   Matt S Trout <mstrout AT 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.