Linux cli command Moose_Cookbook_Roles_ApplicationToInstancepm

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NAME 🖥️ Moose_Cookbook_Roles_ApplicationToInstancepm 🖥️

Applying a role to an object instance

VERSION

version 2.2207

SYNOPSIS

package MyApp::Role::Job::Manager; use List::Util qw( first ); use Moose::Role; has employees => ( is => rw, isa => ArrayRef[Employee], ); sub assign_work { my $self = shift; my $work = shift; my $employee = first { !$_->has_work } @{ $self->employees }; die All my employees have work to do! unless $employee; $employee->work($work); } package main; my $lisa = Employee->new( name => Lisa ); MyApp::Role::Job::Manager->meta->apply($lisa); my $homer = Employee->new( name => Homer ); my $bart = Employee->new( name => Bart ); my $marge = Employee->new( name => Marge ); $lisa->employees( [ $homer, $bart, $marge ] ); $lisa->assign_work(mow the lawn);

DESCRIPTION

In this recipe, we show how a role can be applied to an object. In this specific case, we are giving an employee managerial responsibilities.

Applying a role to an object is simple. The Moose::Meta::Role object provides an apply method. This method will do the right thing when given an object instance.

MyApp::Role::Job::Manager->meta->apply($lisa);

We could also use the apply_all_roles function from Moose::Util.

apply_all_roles( $person, MyApp::Role::Job::Manager->meta );

The main advantage of using apply_all_roles is that it can be used to apply more than one role at a time.

We could also pass parameters to the role we’re applying:

MyApp::Role::Job::Manager->meta->apply( $lisa, -alias => { assign_work => get_off_your_lazy_behind }, );

We saw examples of how method exclusion and alias working in Moose::Cookbook::Roles::Restartable_AdvancedComposition.

CONCLUSION

Applying a role to an object instance is a useful tool for adding behavior to existing objects. In our example, it is effective used to model a promotion.

It can also be useful as a sort of controlled monkey-patching for existing code, particularly non-Moose code. For example, you could create a debugging role and apply it to an object at runtime.

AUTHORS

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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