Added a new cookbook section, extending Moose.

[gitmo/Moose.git] / lib / Moose / Cookbook / Meta / Recipe4.pod

=pod

=head1 NAME

Moose::Cookbook::Meta::Recipe4 - Adding a "table" attribute to the metaclass

=head1 SYNOPSIS

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

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

=head1 DESCRIPTION

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.

=head1 THE METACLASS

The metaclass example really is as simple as the one in the
synopsis. The trick is getting your classes to use this metaclass, and
providing some sort of sugar for declaring the table. This is covered
in L<Moose::Cookbook::Extending::Recipe2>, which shows how to make a
module like C<Moose.pm> itself, with sugar like C<has_table()>.

=head2 Using It

Using this new "table" attribute is quite simple. Let's say we have a
class named C<MyApp::User>, we could simply write the following:

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

As long as MyApp::User has arranged to use C<MyApp::Meta::Class> as
its metaclass, this method call just works.

=head1 SEE ALSO

L<Moose::Cookbook::Meta::Recipe5> - The "table" attribute implemented
via a metaclass trait

=head1 AUTHOR

Dave Rolsky E<lt>autarch@urth.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2006-2008 by Infinity Interactive, Inc.

L<http://www.iinteractive.com>

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=pod