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----
-layout: post
-title: A simple feed aggregator with modern Perl - part 4.1
-summary: In which we had one more article on how to write a feed aggregator.
----
-
-You can thanks [bobtfish](http://github.com/bobtfish) for being such a pedantic guy, 'cause now you will have a better chained examples. He forked my repository from GitHub and fix some code that I'll explain here.
-
-### lib/MyFeedReader.pm
-
-{% highlight perl %}
- package MyFeedReader;
-+use Moose;
-+use namespace::autoclean;
-
--use strict;
--use warnings;
--
--use Catalyst::Runtime '5.70';
-+use Catalyst::Runtime '5.80';
-
--use parent qw/Catalyst/;
-+extends 'Catalyst';
-{% endhighlight %}
-
-You can see that he use [Moose](http://search.cpan.org/perldoc?Moose), so we can remove
-
-{% highlight perl %}
-use strict;
-use warnings;
-{% endhighlight %}
-
-and have a more elegant way to inherit from [Catalyst](http://search.cpan.org/perldoc?Catalyst) with
-
-{% highlight perl %}
-extends 'Catalyst';
-{% endhighlight %}
-
-instead of
-
-{% highlight perl %}
-use parent qw/Catalyst/;
-{% endhighlight %}
-
-He also have updated the **Catalyst::Runtime** version, and added **namespace::autoclean**. The purpose of this module is to keep imported methods out of you namespace. Take a look at the "documentation":http://search.cpan.org/perldoc?namespace::autoclean, it's easy to understand how and why it's usefull.
-
-### lib/MyFeedReader/Controller/Root.pm
-
-{% highlight perl %}
--use strict;
--use warnings;
--use parent 'Catalyst::Controller';
-+use Moose;
-+use namespace::autoclean;
-+BEGIN { extends 'Catalyst::Controller' }
-
--sub index :Path :Args(0) {
-+sub root : Chained('/') PathPart() CaptureArgs(0) {}
-+
-+sub index : Chained('root') PathPart('') Args(0) {
-        my ( $self, $c ) = @_;
-
-        # Hello World
-        $c->response->body( $c->welcome_message );
-    }
-
--sub default :Path {
-+sub default : Private {
-        my ( $self, $c ) = @_;
-        $c->response->body( 'Page not found' );
-        $c->response->status(404);
-{% endhighlight %}
-
-A new method, `root`, that will be the root path for our application. All our methods will be chained from this action. If start you catalyst server and go to **http://localhost:3000/** you will be served with the Catalyst's welcome message as before.
-
-### lib/MyFeedReader/Controller/Entry.pm
-
-{% highlight perl %}
--use warnings;
-+use Moose;
- use MyAggregator::Entry;
--use parent 'Catalyst::Controller';
--
--__PACKAGE__->config->{namespace} = 'entry';
-+use namespace::autoclean;
-+BEGIN { extends 'Catalyst::Controller'; }
-
--sub view : Chained('/') : PathPart('entry') : Args(1) {
-+sub view : Chained('/root') : PathPart('entry') : Args(1) {
-     my ( $self, $c, $id ) = @_;
-
-     $c->stash->{entry} = $c->model('KiokuDB')->lookup($id);
- }
-
--1;
--
-+__PACKAGE__->meta->make_immutable;
-{% endhighlight %}
-
-We extends the **Catalyst::Controller** in a Moose way, and the `make_immutable` instruction is a Moose recommanded best practice (you can alsa add `no Moose` after the make_immutable).
-
-### lib/MyFeedreader/Controller/Feed.pm
-
-{% highlight perl %}
-+use Moose;
-+use namespace::autoclean;
-+BEGIN { extends 'Catalyst::Controller' }
-
--use strict;
--use warnings;
--use parent 'Catalyst::Controller';
-+sub feed : Chained('/root') PathPart('feed') CaptureArgs(0) {}
-
--__PACKAGE__->config->{namespace} = 'feed';
--
--sub index : Path : Args(0) {
-+sub index : Chained('feed') PathPart('') Args(0) {
-     my ( $self, $c ) = @_;
-
-     $c->stash->{feeds}
-         = [ $c->model('MyModel')->resultset('Feed')->search() ];
- }
-
--sub view : Chained('/') : PathPart('feed/view') : Args(1) {
-+sub view : Chained('feed') : PathPart('view') : Args(1) {
-     my ( $self, $c, $id ) = @_;
-
-     $c->stash->{feed}
-         = $c->model('MyModel')->resultset('Feed')->find($id);
- }
-
--1;
-+__PACKAGE__->meta->make_immutable;
-{% endhighlight %}
-
-We got `feed` which is chained to root. `index` is chained to feed, and take no arguments. This method display the list of our feeds. And we got the `view` method, chained to feed too, but with one argument, that display the content of an entry.
-
-If you start the application, you will see the following routes:
-
-
-    .-------------------------------------+--------------------------------------.
-    | Path Spec                           | Private                              |
-    +-------------------------------------+--------------------------------------+
-    | /root/entry/*                       | /root (0)                            |
-    |                                     | => /entry/view                       |
-    | /root/feed                          | /root (0)                            |
-    |                                     | -> /feed/feed (0)                    |
-    |                                     | => /feed/index                       |
-    | /root/feed/view/*                   | /root (0)                            |
-    |                                     | -> /feed/feed (0)                    |
-    |                                     | => /feed/view                        |
-    | /root                               | /root (0)                            |
-    |                                     | => /index                            |
-    '-------------------------------------+--------------------------------------'
-
-I hope you got a better idea about chained action in catalyst now. And again, thanks to bobtfish for the code.