Rails 3 - Nested resources and polymorphic paths: OK to two levels, but break at three

Question

I\'m trying to do a simple family reunion site with: \"posts\", \"families\", \"kids\", and \"pictures\". Ideally I\'d like the routes/relationships to be structured this way:<

Answer 1

Your code example that limited your nesting to 2 levels is quite near the answer. To avoid duplicate routes for fams->kids and kids, you can use the :only option with a blank array so that the 1st-level kids will not generate routes except in the context of kids->pictures, like so:

resources :posts do
  resources :pictures
end

resources :fams do
  resources :pictures
  resources :kids
end

resources :kids, only: [] do # this will not generate kids routes
   resources :pictures
end

For the above code, you can use the following to construct your polymorphic edit url:

polymorphic_url([fam, picture], action: :edit) # using Ruby 1.9 hash syntax
polymorphic_url([kid, picture], action: :edit)