关系 =>通过polymorphic_path? [英] Relationships => through with polymorphic_path?

问题描述

我的模型是:

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 的问题中，我读到我不能这样做@cities.activities，而是我做了以下事情:

I want acces all activities from all the cities. From a previous question on stackoverflow, i read that i can't do this @cities.activities, instead i did the following:

通过关联到 Region 添加 has_many

add has_many through association to Region

class Region < ActiveRecord::Base
  has_many :activities, :through => :cities
end


@activities = @region.activities.find_all_by_homepage_city(true)

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

But when i call the variable @activities use the polymorphic_path.

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

我收到消息不是 region_activity_path 的方法".这是正确的，因为没有资源:资源之后的活动:区域

I get the message "not method for region_activity_path" . This is correct because there is no resources: activities after the resources: regions

resources :regions do 
  resources :cities do
  resources :activities 

我可以在地区之后添加活动资源，但我的网址不正确.我该如何解决这个问题?

I can add activities resources after regions but then my urls are not correct. How can i fix this?

推荐答案

有一个约定，除非严格需要，否则在生成路由时不应超过 2 个级别.

There is convention that you should not go more than 2 levels while generating routes unless its strictly needed.

我建议你选择简单的活动路线而不是3级路线:)

I suggest you choose simple route for activity rather than 3 level of route :)

如果你需要的话 -

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"

这篇关于关系 =>通过polymorphic_path?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！