Adapting plugins error?

[bigtunacan]

In the section on adapting plugins (https://github.com/alindeman/upgradingtorails4/blob/master/text/05_plugins.markdown) it describes setting up an initializer for the plugin and updating autoload_paths in the initializer as follows.

ActiveSupport::Dependencies.autoload_paths << "#{Rails.root}/lib/acts_as_tree/lib"

Trying to require a file that resides in the modified autoload_paths does not get loaded correctly. If I move the autoload_paths modification into the application config file however it works fine.

I noticed in the Rails Guides on autoloading availability (http://guides.rubyonrails.org/autoloading_and_reloading_constants.html#autoloading-availability) the following is mentioned.

config.autoload_paths is accessible from environment-specific configuration files, but any changes made to it outside config/application.rb don't have an effect.

Possibly this was locked down due to security concerns?