Why use :new for own creation actions for restful resources

Rails
1

In AWDWR, (pg415), it suggests using the following to allow the custom
action to create a new resource:

map.resources :articles, :new => { :shortform => :post }

resulting in the following url method and path:

POST /articles/new;shortform

However having new in the url for a standard resource usually presents
the form prior to creation at url:

GET /articles/new

and the posting of the creation actually takes place at the following
URL:

POST /articles

So when adding a custom action to create a resource why not use:

map.resource :articles, :collection => { :shortform => :post }

which results in a url as follows that more closely matches the
standard restful urls?

POST /articles;shortform

2

GET “new” is used to show a form or otherwise give information on how to
create an instance of the resource.

POST “create” is used to create the actual object.

Jason

3

Jason, thanks for taking the time to reply.

I do understand the standard resource routing, however my question is
about the ability to add additional custom actions to the standard
ones. In particular I am puzzled that the examples of this in AWDWR on
page 415 produce urls that do not conform in style to those produced
by by the standard routing.