Moose::Cookbook::Extending::Recipe4(3)

NAME
Moose::Cookbook::Extending::Recipe4 - Acting like Moose.pm and providing sugar Moose-style

VERSION
version 2.0402

SYNOPSIS
  package MyApp::Mooseish;

  use Moose ();
  use Moose::Exporter;

  Moose::Exporter->setup_import_methods(
      with_meta => ['has_table'],
      also      => 'Moose',
  );

  sub init_meta {
      shift;
      return Moose->init_meta( @_, metaclass => 'MyApp::Meta::Class' );
  }

  sub has_table {
      my $meta = shift;
      $meta->table(shift);
  }

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

  extends 'Moose::Meta::Class';

  has 'table' => ( is => 'rw' );

DESCRIPTION
This recipe expands on the use of Moose::Exporter we saw in Moose::Cookbook::Extending::Recipe1. Instead of providing our own object base class, we provide our own metaclass class, and we also export a "has_table" sugar function.

Given the above code, you can now replace all instances of "use Moose" with "use MyApp::Mooseish". Similarly, "no Moose" is now replaced with "no MyApp::Mooseish".

The "with_meta" parameter specifies a list of functions that should be wrapped before exporting. The wrapper simply ensures that the importing package's appropriate metaclass object is the first argument to the function, so we can do "my $meta = shift;".

See the Moose::Exporter docs for more details on its API.

USING MyApp::Mooseish
The purpose of all this code is to provide a Moose-like interface. Here's what it would look like in actual use:

  package MyApp::User;

  use MyApp::Mooseish;

  has_table 'User';

  has 'username' => ( is => 'ro' );
  has 'password' => ( is => 'ro' );

  sub login { ... }

  no MyApp::Mooseish;

All of the normal Moose sugar ("has()", "with()", etc) is available when you "use MyApp::Mooseish".

CONCLUSION
Providing sugar functions can make your extension look much more Moose-ish. See Fey::ORM for a more extensive example.

AUTHOR
Moose is maintained by the Moose Cabal, along with the help of many contributors. See "CABAL" in Moose and "CONTRIBUTORS" in Moose for details.

COPYRIGHT AND LICENSE
This software is copyright (c) 2012 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.