NAME

       Catalyst::Manual::Actions - Catalyst Reusable Actions

DESCRIPTION

       This section of the manual describes the reusable action system in Catalyst, how such
       actions work, descriptions of some existing ones, and how to write your own.  Reusable
       actions are attributes on Catalyst methods that allow you to decorate your method with
       functions running before or after the method call.  This can be used to implement commonly
       used action patterns, while still leaving you full freedom to customize them.

USING ACTIONS

       This is pretty simple. Actions work just like the normal dispatch attributes you are used
       to, like Local or Private:

           sub Hello :Local :ActionClass('SayBefore') {
               $c->res->output( 'Hello '.$c->stash->{what} );
           }

       In this example, we expect the SayBefore action to magically populate stash with something
       relevant before "Hello" is run.  In the next section we'll show you how to implement it.
       If you want it in a namespace other than Catalyst::Action you can prefix the action name
       with a '+', for instance '+Foo::SayBefore', or if you just want it under your application
       namespace instead, use MyAction, like MyAction('SayBefore').

WRITING YOUR OWN ACTIONS

       Implementing the action itself is almost as easy. Just use Catalyst::Action as a base
       class and decorate the "execute" call in the Action class:

           package Catalyst::Action::MyAction;
           use Moose;
           use namespace::autoclean;

           extends 'Catalyst::Action';

           before 'execute' => sub {
               my ( $self, $controller, $c, $test ) = @_;
               $c->stash->{what} = 'world';
           };

           after 'execute' => sub {
               my ( $self, $controller, $c, $test ) = @_;
               $c->stash->{foo} = 'bar';
           };

           __PACKAGE__->meta->make_immutable;

       Pretty simple, huh?

ACTION ROLES

       You can only have one action class per action, which can be somewhat inflexible.

       The solution to this is to use Catalyst::Controller::ActionRole, which would make the
       example above look like this:

           package Catalyst::ActionRole::MyActionRole;
           use Moose::Role;

           before 'execute' => sub {
               my ( $self, $controller, $c, $test ) = @_;
               $c->stash->{what} = 'world';
           };

           after 'execute' => sub {
               my ( $self, $controller, $c, $test ) = @_;
               $c->stash->{foo} = 'bar';
           };

           1;

       and this would be used in a controller like this:

           package MyApp::Controller::Foo;
           use Moose;
           use namespace::autoclean;
           BEGIN { extends 'Catalyst::Controller::ActionRole'; }

           sub foo : Does('MyActionRole') {
               my ($self, $c) = @_;
           }

           1;

EXAMPLE ACTIONS

   Catalyst::Action::RenderView
       This is meant to decorate end actions. It's similar in operation to
       Catalyst::Plugin::DefaultEnd, but allows you to decide on an action level rather than on
       an application level where it should be run.

   Catalyst::Action::REST
       Provides additional syntax for dispatching based upon the HTTP method of the request.

EXAMPLE ACTIONROLES

   Catalyst::ActionRole::ACL
       Provides ACLs for role membership by decorating your actions.

AUTHORS

       Catalyst Contributors, see Catalyst.pm

COPYRIGHT

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