ruby-on-rails - 使用另一个模型 ID 的 Rails 自定义路由

Question

我想创建一个自定义路由，例如 'photos/:user_id/:photo_id' 来显示每张照片。在我的路线文件中；

get 'photos/:user_id/:photo_id' => 'photos#show', :as => 'user_photo'

和 rake routes 给我

user_photo GET       /photos/:user_id/:photo_id(.:format)   photos#show

编辑；

现在，当我使用 link_to 'some photo', user_photo_path(@photo,@user) 链接到照片时，我只收到以下错误

Processing by PhotosController#show as HTML
  Parameters: {"user_id"=>"8", "photo_id"=>"8"}
  User Load (0.6ms)  SELECT  "users".* FROM "users"  WHERE "users"."id" = 8  ORDER BY "users"."id" ASC LIMIT 1
Completed 404 Not Found in 3ms

ActiveRecord::RecordNotFound - Couldn't find Photo without an ID:
  activerecord (4.1.1) lib/active_record/relation/finder_methods.rb:402:in `find_with_ids'
  activerecord (4.1.1) lib/active_record/relation/finder_methods.rb:68:in `find'
  activerecord (4.1.1) lib/active_record/querying.rb:3:in `find'
   () Users/batman/code/myapp/app/controllers/photos_controller.rb:73:in `set_photo'

Answer 1

您需要将其添加到参数中:

link_to 'some photo', user_photo_path(@photo.user, @photo)

第二个错误是由您查找照片的方式引起的。您很可能会:

photo = Photo.find(params[:id])

如果是这种情况，您需要将 params[:id] 更改为 parmas[:photo_id](如果在 中完成，可能会阻止其他操作before_filter 或将您的路线更改为:

get 'photos/:user_id/:id' => 'photos#show', :as => 'user_photo'