Rails：路由嵌套资源有什么好的参考/指南/指南吗？

resources:photos

photos_path returns /photos
new_photo_path returns /photos/new
edit_photo_path(id) returns /photos/:id/edit (for instance, edit_photo_path(10) returns /photos/10/edit)
photo_path(id) returns /photos/:id (for instance, photo_path(10) returns /photos/10)

resources :chapters do
     resources :questions do
       resources :answers
     end
end

rake routes