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


version 2.0010


  package MyApp::Mooseish;

  use Moose ();
  use Moose::Exporter;

      with_meta => ['has_table'],
      also      => 'Moose',

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

  sub has_table {
      my $meta = shift;

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

  extends 'Moose::Meta::Class';

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


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 name is the first argument to the function, so we can do my $caller = 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.


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


Stevan Little <>


This software is copyright (c) 2011 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.