nested routes + scaffolding

[oerdec]

Hello all,

I'm trying to understand nested routes at the moment.
I generated these three models with the scaffold generator:

class Category < ActiveRecord::Base
  has_many :topics
end
 
class Topic < ActiveRecord::Base
  belongs_to :category
  has_many :posts
end
 
class Post < ActiveRecord::Base
  belongs_to :topic
end

Because all models belong together I defined the following nested routes:

map.resources :categories do |categories|
  categories.resources :topics do |topics|
    topics.resources :posts
  end
end

With these routes I have to change most of the generated views and controllers. For example instead of topic_path(params[:id]) it has to be category_topic_path(params[:category_id], params[:id]) and so on.

Is there any way to make this easier and less error prone?

I know it's not a good idea to have to deeply nested routes. But otherwise I don't know how to get all needed information. To create a topic for example I need the category_id ...

Thanks for any advices.

oerdec