Rails - Nov 2011 - 2.3 to 3.1 upgrade: RESTful routes now required when using link_to("foo", @object) ?

I''m upgrading my application from Rails 2.3.11 to 3.1.1. After
updating my routes file with the new syntax, I''m seeing a change in
behavior of the link_to method when passing an ActiveRecord object as
the link destination.

Here is an example of an old (non-RESTful) route from my 2.3
application''s routes.rb:

~~~~~~~
map.with_options :controller => ''widget'' do |widget|
    widget.widget ''widget/show/:id'', :action =>
''show''
end
~~~~~~~

Here is what this route became in my 3.1 file:

~~~~~~~
controller :widget do
  scope "widget" do
    match "show/:id", :action => "show", :as =>
:widget
  end
end
~~~~~~~

The output of `rake routes` is similar. 2.3:

widget          /widget/show(/:id)
{:controller=>"widget", :action=>"show"}

3.1:

widget          /widget/show/:id(.:format)
{:action=>"show", :controller=>"widget"}

What''s different is that now my link_to calls that look like this:

link_to("Text", @widget_object)

Produce this error message:

"Routing Error: No route matches
{ :controller=>"widget", :action=>"show",
:id=>#<Widget id:
123, .....> }"

After seeing this passage in the Rails Guides:

"<%= link_to "Magazine details", @magazine %>...This allows
you to
treat instances of your models as URLs, and is a key advantage to
using the resourceful style."
--http://guides.rubyonrails.org/routing.html#creating-paths-and-urls-
from-objects

my guess is that Rails 2.3 happily handled my link_tos because my
named route was widget_path/widget_url (changing the name would cause
my 2.3 app''s link_tos to break as well), but Rails 3 insists on
RESTful/resourceful routes if you''re going to use this link_to style.

Is that right? I''ve started refactoring and adding the necessary
RESTful routes to make my link_tos work again — with good results —
but I want to confirm that I really understand the problem.


William

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