rake_routes

    category_links GET    /categories/:category_id/links(.:format)          link
s#index
                   POST   /categories/:category_id/links(.:format)          link
s#create
 new_category_link GET    /categories/:category_id/links/new(.:format)      link
s#new
edit_category_link GET    /categories/:category_id/links/:id/edit(.:format) link
s#edit
     category_link GET    /categories/:category_id/links/:id(.:format)      link
s#show
                   PUT    /categories/:category_id/links/:id(.:format)      link
s#update
                   DELETE /categories/:category_id/links/:id(.:format)      link
s#destroy
        categories GET    /categories(.:format)                             cate
gories#index
                   POST   /categories(.:format)                             cate
gories#create
      new_category GET    /categories/new(.:format)                         cate
gories#new
     edit_category GET    /categories/:id/edit(.:format)                    cate
gories#edit
          category GET    /categories/:id(.:format)                         cate
gories#show
                   PUT    /categories/:id(.:format)                         cate
gories#update
                   DELETE /categories/:id(.:format)                         cate
gories#destroy
              root        /                                                 cate
gories#index