CanCan singleton loading with pluralized class name - cancan

Question

I'm currently experiencing an issue with the latest version of CanCan. It seems that the gem won't load singleton resources with pluralized names.
class Preferences < ActiveRecord::Base
self.table_name = 'preferences'
belongs_to :user
end
class User < ActiveRecord::Base
has_one :preferences
end
#controller
class PreferencesController < ApplicationController
before_filter :authenticate_user! #from Devise
load_and_authorize_resource :singleton => true,
:through => :current_user,
:through_association => :preferences,
:parent => false
end
#ability.rb
class Ability
include CanCan::Ability
def initialize(user)
can [:read, :update], Preferences, :user_id => user.id
end
end
I keep getting an error like this when I run my controller spec:
Failures:
1) PreferencesController GET #show should return http success
Failure/Error: get :show
NameError:
uninitialized constant Preference
# ./spec/controllers/preferences_controller_spec.rb:10:in `block (3 levels) in <top (required)>'
It seems no matter what combination of load_resource arguments I try, I can't get my specs to pass again without reverting back to loading the resource manually like this:
class PreferencesController < ApplicationController
before_filter :authenticate_user!
def show
#preferences = current_user.preferences
authorize! :read, #preferences
end
end
Is there some magic combination of load_and_authorize_resource parameters I need to use? I have this same configuration working in another singleton controller where the resource falls under normal Rails conventions (i.e. User has_one :profile), so I know this works already under normal situations.