1Catalyst::Manual::ActioUnsse(r3)Contributed Perl DocumenCtaattailoynst::Manual::Actions(3)
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NAME

6       Catalyst::Manual::Actions - Catalyst Reusable Actions
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DESCRIPTION

9       This section of the manual describes the reusable action system in
10       Catalyst, how such actions work, descriptions of some existing ones,
11       and how to write your own.  Reusable actions are attributes on Catalyst
12       methods that allow you to decorate your method with functions running
13       before or after the method call.  This can be used to implement
14       commonly used action patterns, while still leaving you full freedom to
15       customize them.
16

USING ACTIONS

18       This is pretty simple. Actions work just like the normal dispatch
19       attributes you are used to, like Local or Private:
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21           sub Hello :Local :ActionClass('SayBefore') {
22               $c->res->output( 'Hello '.$c->stash->{what} );
23           }
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25       In this example, we expect the SayBefore action to magically populate
26       stash with something relevant before "Hello" is run.  In the next
27       section we'll show you how to implement it. If you want it in a
28       namespace other than Catalyst::Action you can prefix the action name
29       with a '+', for instance '+Foo::SayBefore', or if you just want it
30       under your application namespace instead, use MyAction, like
31       MyAction('SayBefore').
32

WRITING YOUR OWN ACTIONS

34       Implementing the action itself is almost as easy. Just use
35       Catalyst::Action as a base class and decorate the "execute" call in the
36       Action class:
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38           package Catalyst::Action::MyAction;
39           use Moose;
40           use namespace::autoclean;
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42           extends 'Catalyst::Action';
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44           before 'execute' => sub {
45               my ( $self, $controller, $c, $test ) = @_;
46               $c->stash->{what} = 'world';
47           };
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49           after 'execute' => sub {
50               my ( $self, $controller, $c, $test ) = @_;
51               $c->stash->{foo} = 'bar';
52           };
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54           __PACKAGE__->meta->make_immutable;
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56       Pretty simple, huh?
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ACTION ROLES

59       You can only have one action class per action, which can be somewhat
60       inflexible.
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62       The solution to this is to use Catalyst::Controller::ActionRole, which
63       would make the example above look like this:
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65           package Catalyst::ActionRole::MyActionRole;
66           use Moose::Role;
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68           before 'execute' => sub {
69               my ( $self, $controller, $c, $test ) = @_;
70               $c->stash->{what} = 'world';
71           };
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73           after 'execute' => sub {
74               my ( $self, $controller, $c, $test ) = @_;
75               $c->stash->{foo} = 'bar';
76           };
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78           1;
79
80       and this would be used in a controller like this:
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82           package MyApp::Controller::Foo;
83           use Moose;
84           use namespace::autoclean;
85           BEGIN { extends 'Catalyst::Controller::ActionRole'; }
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87           sub foo : Does('MyActionRole') {
88               my ($self, $c) = @_;
89           }
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91           1;
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EXAMPLE ACTIONS

94   Catalyst::Action::RenderView
95       This is meant to decorate end actions. It's similar in operation to
96       Catalyst::Plugin::DefaultEnd, but allows you to decide on an action
97       level rather than on an application level where it should be run.
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99   Catalyst::Action::REST
100       Provides additional syntax for dispatching based upon the HTTP method
101       of the request.
102

EXAMPLE ACTIONROLES

104   Catalyst::ActionRole::ACL
105       Provides ACLs for role membership by decorating your actions.
106

AUTHORS

108       Catalyst Contributors, see Catalyst.pm
109

111       This library is free software. You can redistribute it and/or modify it
112       under the same terms as Perl itself.
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116perl v5.36.0                      2022-07-22      Catalyst::Manual::Actions(3)
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