关系=>通过polymorphic_path？

我的模特是：

class City < ActiveRecord::Base belongs_to :region has_many :activities has_many :restaurants end class Activity < ActiveRecord::Base belongs_to :city end 

我想访问所有城市的所有活动。 从上一个关于stackoverflow的问题，我读到我不能这样做@ cities.activities，而是我做了以下事情：

通过与Region的关联添加has_many

 class Region  :cities end @activities = @region.activities.find_all_by_homepage_city(true) 

但是当我调用变量@activities时，请使用polymorphic_path。

 - @activities.each do |b| %li =link_to b.name, polymorphic_path([@region, @city, b]) 

我收到消息“not region for region_activity_path”。 这是正确的，因为没有资源：资源之后的活动：区域

 resources :regions do resources :cities do resources :activities 

我可以在区域之后添加活动资源，但后来我的url不正确。 我怎样才能解决这个问题？

Answer 1

除非严格要求，否则在生成路线时不应超过2个等级。

我建议你choose simple route for activity而不是3级路线:)

如果你需要的话还是 –

 rake routes | grep activi region_city_activities GET /regions/:region_id/cities/:city_id/activities(.:format) {:action=>"index", :controller=>"activities"} POST /regions/:region_id/cities/:city_id/activities(.:format) {:action=>"create", :controller=>"activities"} new_region_city_activity GET /regions/:region_id/cities/:city_id/activities/new(.:format) {:action=>"new", :controller=>"activities"} edit_region_city_activity GET /regions/:region_id/cities/:city_id/activities/:id/edit(.:format) {:action=>"edit", :controller=>"activities"} region_city_activity GET /regions/:region_id/cities/:city_id/activities/:id(.:format) {:action=>"show", :controller=>"activities"} PUT /regions/:region_id/cities/:city_id/activities/:id(.:format) {:action=>"update", :controller=>"activities"} DELETE /regions/:region_id/cities/:city_id/activities/:id(.:format) {:action=>"destroy", :controller=>"activities"} rails c -> app.polymorphic_path([Region.last, City.first, Activity.last]) => "/regions/28/cities/1/activities/12" -> app.polymorphic_path([Region.last, City.first, Activity.new]) => "/regions/28/cities/1/activities"