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Catalyst::Component.3pm

NAME

Catalyst::Component - Catalyst Component Base Class

SYNOPSIS

     # lib/MyApp/Model/Something.pm
     package MyApp::Model::Something;
 
     use base 'Catalyst::Component';
 
     __PACKAGE__->config( foo => 'bar' );
 
     sub test {
         my $self = shift;
         return $self->{foo};
     }
 
     sub forward_to_me {
         my ( $self, $c ) = @_;
         $c->response->output( $self->{foo} );
     }
 
     1;
 
     # Methods can be a request step
     $c->forward(qw/MyApp::Model::Something forward_to_me/);
 
     # Or just methods
     print $c->comp('MyApp::Model::Something')->test;
 
     print $c->comp('MyApp::Model::Something')->{foo};
 
 

DESCRIPTION

This is the universal base class for Catalyst components (Model/View/Controller).

It provides you with a generic new() for instantiation through Catalyst's component loader with config() support and a process() method placeholder.

METHODS

new($app, $arguments)

Called by COMPONENT to instantiate the component; should return an object to be stored in the application's component hash.

COMPONENT

"my $component_instance = $component->COMPONENT($app, $arguments);"

If this method is present (as it is on all Catalyst::Component subclasses, it is called by Catalyst during setup_components with the application class as $app and any config entry on the application for this component (for example, in the case of MyApp::Controller::Foo this would be "MyApp->config('Controller::Foo' => \%conf").

The arguments are expected to be a hashref and are merged with the "__PACKAGE__->config" hashref before calling "->new" to instantiate the component.

You can override it in your components to do custom instantiation, using something like this:

   sub COMPONENT {
       my ($class, $app, $args) = @_;
       $args = $self->merge_config_hashes($self->config, $args);
       return $class->new($app, $args);
   }
 
 

$c->config

$c->config($hashref)

$c->config($key, $value, ...)

Accessor for this component's config hash. Config values can be set as key value pair, or you can specify a hashref. In either case the keys will be merged with any existing config settings. Each component in a Catalyst application has its own config hash.

$c->process()

This is the default method called on a Catalyst component in the dispatcher. For instance, Views implement this action to render the response body when you forward to them. The default is an abstract method.

$c->merge_config_hashes( $hashref, $hashref )

Merges two hashes together recursively, giving right-hand precedence. Alias for the method in Catalyst::Utils.

$c->expand_modules( $setup_component_config )

Return a list of extra components that this component has created. By default, it just looks for a list of inner packages of this component

OPTIONAL METHODS

ACCEPT_CONTEXT($c, @args)

Catalyst components are normally initialized during server startup, either as a Class or a Instance. However, some components require information about the current request. To do so, they can implement an ACCEPT_CONTEXT method.

If this method is present, it is called during $c->comp/controller/model/view with the current $c and any additional args (e.g. $c->model('Foo', qw/bar baz/) would cause your MyApp::Model::Foo instance's ACCEPT_CONTEXT to be called with ($c, 'bar', 'baz')) and the return value of this method is returned to the calling code in the application rather than the component itself.

SEE ALSO

Catalyst, Catalyst::Model, Catalyst::View, Catalyst::Controller.

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.