Rails嵌套关联和重新编号(Rails nested association and restarted numbering)

 如果我有这样的嵌套资源： 
 
resources :users
  resources :posts
end
 
 和一个user has_many posts ，有可能让Rails根据URL中的父关联开始编号？ 例如，目前，嵌套资源仅抓取ID： 
 
@user.posts.find(params[:id])
 
 这正确地命名空间的帖子，只允许来自@user帖子...但是，有没有办法让post_id是独立的？ IE我希望每个用户的帖子从1开始，其中： 
 
/users/1/posts/1
/users/2/posts/1
 
 其实指两个不同的职位？ 

If I have a nested resource like so:
 
resources :users
  resources :posts
end
 
and a user has_many posts, it is possible to have Rails start numbering based on the parent association in the URL? For example, currently, nesting resources just grabs the ID:
 
@user.posts.find(params[:id])
 
This correctly namespaces the posts, only allowing posts from @user... however, is there a way such that the post_id is independent? I.E. I want each user's posts to start at 1, where:
 
/users/1/posts/1
/users/2/posts/1
 
Actually refer to two different posts?

原文：https://stackoverflow.com/questions/8752120