Models in sub-folders in Rails 3

I have a Rails 2 project in which models are in sub-folders, but not in a name space

app/models/sub_folder/posts.rb

class Post < ActiveRecord::Base end

The controllers are also in sub-folders, but are name spaced (views also in a corresponding sub_folder).

app/controllers/sub_folder/posts_controller.rb

class SubFolder::PostsController < ApplicationController end

This works fine, but I want to move on to Rails 3, and it all falls apart...

In application.rb I have

    config.autoload_paths += Dir["#{config.root}/app/models/**/"]

So Rails should be able to find the models. However running tests (which are subfoldered in an analogous way), I get

LoadError: Expected R:/test3/app/models/sub_folder/post.rb to define SubFolder::Post

So okay, suppose I name-space my models? Now I get:

LoadError: Expected R:/test3/app/models/sub_folder/post.rb to define Post

Taking the model out of it sub-folder does allow the tests to pass, but my real project has over 30 models, and I really do want them to be structured somehow.

Running on Rails version 3.2.2, with Ruby 1.9.2, on JRuby 1.6.7 by the way, and all the above are from a simple test project that I created just for this purpose; no custom code except as noted above. I have found several web pages about this issue, but they just indicate the config.autoload_paths bit should solve the problem; am I missing something simple here?

Hi,   In model i.e app/models/sub_folder/posts.rb you need to specify sub_folder namespace to it then it will work.

Eg:- class SubFolder::Post < ActiveRecord::Base end

whenever u fire any query you need to specify SubFolder::Post.all

Then only it will work .