rota para nested resources dentro de namespace

nested_resource_with_namespace.rb

namespace :admin do
      resources :galleries do
        #resource :images #wrong
        resources :images #right
      end
end



# admin/galleries/show.html.erb
# ...
<%= render :partial => "/admin/images/image", :collection => @gallery.images %>
# ...

# admin/images/_image.html.erb
<div class="thumb">
        <%= image.name %> <br/ >
        <%= image_tag image.img.url(:thumb) %><br/ >
        <%= link_to 'Edit', [:admin, @gallery, image],
               :method => :edit %>
        <%= link_to 'Delete', [:admin, @gallery, image],
               :confirm => 'Are you sure?',
               :class => 'delete-btn',
               :method => :delete %>
</div>

rotas-da-app-que-funciona.txt

gallery_images GET    /galleries/:gallery_id/images(.:format)          images#index
                   POST   /galleries/:gallery_id/images(.:format)          images#create
 new_gallery_image GET    /galleries/:gallery_id/images/new(.:format)      images#new
edit_gallery_image GET    /galleries/:gallery_id/images/:id/edit(.:format) images#edit
     gallery_image GET    /galleries/:gallery_id/images/:id(.:format)      images#show
                   PUT    /galleries/:gallery_id/images/:id(.:format)      images#update
                   DELETE /galleries/:gallery_id/images/:id(.:format)      images#destroy
         galleries GET    /galleries(.:format)                             galleries#index
                   POST   /galleries(.:format)                             galleries#create
       new_gallery GET    /galleries/new(.:format)                         galleries#new
      edit_gallery GET    /galleries/:id/edit(.:format)                    galleries#edit
           gallery GET    /galleries/:id(.:format)                         galleries#show
                   PUT    /galleries/:id(.:format)                         galleries#update
                   DELETE /galleries/:id(.:format)                         galleries#destroy

rotas-da-app-que-nao-funciona-com-namespace

     admin_gallery_images POST   /admin/galleries/:gallery_id/images(.:format)      admin/images#create
 new_admin_gallery_images GET    /admin/galleries/:gallery_id/images/new(.:format)  admin/images#new
edit_admin_gallery_images GET    /admin/galleries/:gallery_id/images/edit(.:format) admin/images#edit
                          GET    /admin/galleries/:gallery_id/images(.:format)      admin/images#show
                          PUT    /admin/galleries/:gallery_id/images(.:format)      admin/images#update
                          DELETE /admin/galleries/:gallery_id/images(.:format)      admin/images#destroy
          admin_galleries GET    /admin/galleries(.:format)                         admin/galleries#index
                          POST   /admin/galleries(.:format)                         admin/galleries#create
        new_admin_gallery GET    /admin/galleries/new(.:format)                     admin/galleries#new
       edit_admin_gallery GET    /admin/galleries/:id/edit(.:format)                admin/galleries#edit
            admin_gallery GET    /admin/galleries/:id(.:format)                     admin/galleries#show
                          PUT    /admin/galleries/:id(.:format)                     admin/galleries#update
                          DELETE /admin/galleries/:id(.:format)                     admin/galleries#destroy

rotas-da-app-que-nao-funciona.txt

     gallery_images POST   /galleries/:gallery_id/images(.:format)      images#create
 new_gallery_images GET    /galleries/:gallery_id/images/new(.:format)  images#new
edit_gallery_images GET    /galleries/:gallery_id/images/edit(.:format) images#edit
                    GET    /galleries/:gallery_id/images(.:format)      images#show
                    PUT    /galleries/:gallery_id/images(.:format)      images#update
                    DELETE /galleries/:gallery_id/images(.:format)      images#destroy
          galleries GET    /galleries(.:format)                         galleries#index
                    POST   /galleries(.:format)                         galleries#create
        new_gallery GET    /galleries/new(.:format)                     galleries#new
       edit_gallery GET    /galleries/:id/edit(.:format)                galleries#edit
            gallery GET    /galleries/:id(.:format)                     galleries#show
                    PUT    /galleries/:id(.:format)                     galleries#update
                    DELETE /galleries/:id(.:format)                     galleries#destroy