[Catalyst] PathPart help

Jason Kohles email at jasonkohles.com
Fri Nov 16 13:30:39 GMT 2007

On Nov 15, 2007, at 11:31 PM, Les Fletcher wrote:

> That one seems to use as explicit "view" at the end of the url  
> instead of having the identifier be the last piece of the url.
To have one without the 'view', just use an empty PathPart like  
'default' below...

The one problem with your design though, is the trouble with being  
able to support either an id or an argument (like 'create') as the  
second item in the field.  Because of the problems with that, I  
usually use an explicit 'id' part to identify where the id starts,  
like so...

sub base : Chained('/') PathPart('namespace') CaptureArgs(0) { }

sub id : Chained('base') PathPart('id') CaptureArgs(1) {
	my ( $self, $c, $id ) = @_;
	$c->stash->{ 'object' } $c->model( 'MyModel' )->find( $id );

sub edit : Chained('id') PathPart('edit') Args(0) { }

sub view : Chained('id') PathPart('view') Args(0) { }

sub default : Chained('id') PathPart('') Args(0) {
	my ( $self, $c ) = @_;
	$c->forward( 'view' );

sub create : Chained('base') PathPart('create') Args(0) { }

This way things that you can do without a specific object (like  
'create', 'list', 'search') just get chained to 'base', while things  
that require an object ('edit', 'view', 'delete') get chained to 'id',  
which is responsible for finding and stashing the object (I also  
usually put the access control stuff there to determine if the user is  
allowed to view/edit/delete that object.)

> Peter Karman wrote:
>> Les Fletcher wrote on 11/15/07 1:47 PM:
>>> I have question about setting up PathPart's and Chaining.  I am  
>>> trying
>>> to set something that has the following look:
>>> /namespace/ => This lists out a list of objects
>>> /namespace/<id> => displays detail information about the object  
>>> with the
>>> numeric id=<id>
>>> /namespace/<id>/edit => brings up a form to edit object with numeric
>>> id=<id>
>>> /namespace/create => brings up a form to create a new object
>> This controller implements that exact API:
>> http://search.cpan.org/~karman/Catalyst-Controller-Rose-0.04/lib/Catalyst/Controller/Rose/CRUD.pm
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