Question

Given the following resource definition:

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

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

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

But is there a way to make this work?

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

Currently it throws this error:

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

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.

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

Answer 1

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