[Catalyst] Per request data in controller base class

[Sir Robert Burbridge]

On 11/23/2010 09:12 PM, Bill Moseley wrote:
> I have a controller base class that needs to stash some data per =

> request.  My question is where to put that data (stash would seem =

> best) -- and how to name it.
>
> This class is an auto-CRUD-like controller base class that does the =

> mundane work of fetching objects.  For example:
>
> package MyApp::Controller::CD;
> use parent 'My::Controller::CRUD';
> 1;
>
> Which then will provided an action that handles "GET /cd/$id" which =

> will fetch the CD object and place it someplace.  For example, I could =

> just put it in $c->stash->{item}.
>
> Now, controllers can be chained together, so for example I might have =

> a chain /cd/*/track/*/movement/* which all use the same base class, =

> and where in the "movement" action I might want to be able to fetch =

> the cd and track objects fetched when processing the chain.  So, =

> $c->stash->{item} isn't such a good name.
>
Suggeston:  You already have the information encoded into the URI in a =

guaranteed unique way; keep the same convention for the stash.

    package MyApp::WUI::Controller::CD;
    use Moose;
    use namespace::autoclean;
    BEGIN {extends 'Catalyst::Controller'}

    sub index :Chained('/') :PathPart('cd') :CaptureArgs(1) {
       my ($self, $c, $id) =3D @_;
       $c->stash(cd =3D>
    $c->model('MyApp')->resultset('CD')->find({id=3D>$id}));
    }

    package MyApp::WUI::Controller::CD::Track;
    use Moose;
    use namespace::autoclean;
    BEGIN {extends 'Catalyst::Controller'}

    sub index :ChainedParent :PathPart('track') :CaptureArgs(1) {
       my ($self, $c, $id) =3D @_;
       $c->stash(track =3D> $c->stash->{$cd}->track($id));
    }

    package MyApp::WUI::Controller::CD::Track::Movement;
    use Moose;
    use namespace::autoclean;
    BEGIN {extends 'Catalyst::Controller'}

    sub index :ChainedParent :PathPart('movement') :CaptureArgs(1) {
       my ($self, $c, $id) =3D @_;
       $c->stash(movement =3D> $c->stash->{track}->movement($id));
    }

-Sir

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