Allow default scope to beconfigured.

test/devise_test.rb

@@ -66,6 +66,10 @@ class DeviseTest < ActiveSupport::TestCase
     assert manager.silence_missing_strategies
   end
 
+  test 'warden default scope is set' do
+    assert_equal :user, Warden::Manager.default_scope
+  end
+
   test 'warden manager user configuration through a block' do
     begin
       @executed = false

test/rails_app/config/routes.rb

@@ -4,7 +4,7 @@ ActionController::Routing::Routes.draw do |map|
   map.devise_for :account, :path_names => {
     :sign_in => 'login', :sign_out => 'logout', :password => 'secret', :confirmation => 'verification'
   }
-  map.devise_for :organizers, :singular => 'manager',
+  map.devise_for :organizers, :scope => 'manager',
                               :path_prefix => '/:locale',
                               :requirements => { :extra => 'value' }