Manual Reference Pages - MOOSE::COOKBOOK::LEGACY::TABLE_CLASSMETACLASS (3)
Moose::Cookbook::Legacy::Table_ClassMetaclass - Adding a "table" attribute to the metaclass
has table => (
is => rw,
isa => Str,
<B>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.B>
In this recipe, well 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.
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 metaclasss class:
$table = MyApp::User->meta->table
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
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
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.
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