Does anybody have any tips for managing polymorphic nested resources in Rails 3?

Question

In config/routes.rb:

resources :posts do
  resources :comments
end

resources :pictures do
  resources :comments
end

I would like to allow for

Answer 1

Drawing on Uriptical's answer, I found the relationships to work but named routes still did not.

I'm still pretty new at rails 3 but I found a simple solution using eval.

For instance, in my project, the polymorphic parents (represented in my app as the mongoid objects Product and Category) are defined as @imagable using a modification of find_comentable and the child being edited is referred to as @image.

a url such as product_image_path(@imagable, @image) which does GET => products/:product_id/images/ can be replaced with:

send("#{@imagable.class.name.downcase}_image_url", @imagable, image )

This works for all named paths. For instance:

link_to 'Edit', send("edit_#{@imagable.class.name.downcase}_image_path", @imagable, image ) 
link_to 'Destroy', send("#{@imagable.class.name.downcase}_image_url", @imagable, image), :confirm => 'Are you sure?', :method => :delete

The downside to this is it leaves sends all over your views and in controllers wherever you have redirects.

Is there a more elegant solution to do this via routes?

*replaced eval with send