Rails 3：带有to_param的嵌套Restful路由被反转

Question

＃解释上下文

puts "I am learning Rails, building a simple forum application."
puts "I am pretty satisfied to where I got so far but routes... "
puts "...still figuring them out."
puts "Been 2 days trying all sorts of things."
puts "This is where I am now, and something is not working as expected."
puts "Any help/pointers would be appreciated! :)"

#config / routes.rb

scope "/helpcenter" do
  resources :cat, :controller => "forums", :as => :forums do
    resources :topics , :controller => "forum_topics", :as => :topics
    resources :posts, :controller => "forum_posts", :as => :posts
  end
end

match "/helpcenter" => "forums#index", :as => :forums

＃app / models / forum.rb

class Forum < ActiveRecord::Base
  def to_param
    "#{id}-#{name.parameterize}"
  end
end

＃app / models / forum_topic.rb

class ForumTopic < ActiveRecord::Base
  def to_param
    "#{id}-#{name.parameterize}"
  end
end

＃app / controllers / forums / show.hmtl.erb

link_to @forum_topic.name, forum_topic_path(@forum_topic)
# OR
link_to @forum_topic.name, @forum_topic

＃link_to生成什么：

"/helpcenter/cat/1-first-topic/topics/1-first-forum"

＃我期望看到的内容（因为主题应该在论坛中）：

"/helpcenter/cat/1-first-forum/topics/1-first-topic"

＃我做错了什么？

puts "Thanks!"

Answer 1

主要路径应为：

forum_topic_path(@forum, @topic)  
forum_topics_path(@forum)

你传入的参数（@forum_topic）

link_to @forum_topic.name, forum_topic_path(@forum_topic)

有一个：id与之关联（1），因此它将显示id = 1的论坛。您还应该传递主题ID

forum_topic_path(@forum, @topic)

感到惊讶的是没有id没有得到错误 - 我猜测它推断了两个资源的id。

Answer 2

您好我想要生成指向特殊论坛特殊主题的链接。

当你生成链接时，你需要2个ID（ - 或2个intances，一个用于论坛，一个用于主题）。

link_to @forum_topic.name, forum_topic_path(@forum, @forum_topic)