自定义 RESTful 资源的 url_for(复合键；不仅仅是 id)

问题描述

给定以下资源定义:

map.resources :posts, :except => [:show]
map.post '/:year/:month/:slug, :controller => :posts, :action => :show

我可以使用以下语法让 url_for 为我工作:

I can make url_for work for me, using this syntax:

<%= link_to @post.title, post_url(:year => '2010', :month => '02', :slug => 'test') %>

但是有没有办法让这个工作?

But is there a way to make this work?

<%= link_to @post.title, @post %>

目前它抛出这个错误:

No route matches {:year=>#<Post id: 1, title: "test", (...)>, :controller=>"posts", :action=>"show"}

显然它将@post 对象传递给第一个路由参数(似乎是 Rails 错误...).但是我可以为我做这件事吗?我要补充一点，搞乱 default_url_options 是一个死胡同.

Apparently it passes the @post object to the first route parameter (seems like a Rails bug...). But can I make this work for me? I'll add that messing with default_url_options is a dead end.

仅适用于 Rails 3.x 的解决方案是可以的，但我不想使用任何插件.

Solution working only in Rails 3.x is ok, but I would prefer not to use any plugins.

推荐答案

如何为 PostsController 修复 url_for?可能不是很优雅，但它是干的，事情应该可以正常工作.

How about fixing url_for for the PostsController? May not be very elegant but it is DRY and things should just work.

# app/controllers/posts_controller.rb 
class PostsController < ApplicationController

  protected

    def url_for(options = {} )
      if options[:year].class.to_s == "Post"
        obj = options[:year]
        options[:year] = obj.year
        options[:month] = obj.month
        options[:slug] = obj.slug
      end
      super(options)
    end

end

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