Try to fix the misterious case where some url helpers are not defined.

lib/devise.rb

@@ -382,13 +382,10 @@ module Devise
 
   # Include helpers in the given scope to AC and AV.
   def self.include_helpers(scope)
+    Rails.application.routes.url_helpers.send :include, scope::UrlHelpers
+
     ActiveSupport.on_load(:action_controller) do
       include scope::Helpers if defined?(scope::Helpers)
-      include scope::UrlHelpers
-    end
-
-    ActiveSupport.on_load(:action_view) do
-      include scope::UrlHelpers
     end
   end
 

lib/devise/controllers/url_helpers.rb

@@ -24,25 +24,31 @@ module Devise
         end
       end
 
-      def self.generate_helpers!
-        mappings = Devise.mappings.values.map(&:used_helpers).flatten.uniq
-        routes = Devise::URL_HELPERS.slice(*mappings)
+      def self.generate_helpers!(routes=nil)
+        routes ||= begin
+          mappings = Devise.mappings.values.map(&:used_helpers).flatten.uniq
+          Devise::URL_HELPERS.slice(*mappings)
+        end
 
         routes.each do |module_name, actions|
           [:path, :url].each do |path_or_url|
             actions.each do |action|
               action = action ? "#{action}_" : ""
+              method = "#{action}#{module_name}_#{path_or_url}"
 
               class_eval <<-URL_HELPERS, __FILE__, __LINE__ + 1
-                def #{action}#{module_name}_#{path_or_url}(resource_or_scope, *args)
+                def #{method}(resource_or_scope, *args)
                   scope = Devise::Mapping.find_scope!(resource_or_scope)
                   send("#{action}\#{scope}_#{module_name}_#{path_or_url}", *args)
                 end
+                protected :#{method}
               URL_HELPERS
             end
           end
         end
       end
+
+      generate_helpers!(Devise::URL_HELPERS)
     end
   end
 end

lib/devise/omniauth/url_helpers.rb

@@ -3,9 +3,10 @@ module Devise
     module UrlHelpers
       def self.define_helpers(mapping)
         return unless mapping.omniauthable?
+        method = "#{mapping.name}_omniauth_authorize_path"
 
         class_eval <<-URL_HELPERS, __FILE__, __LINE__ + 1
-          def #{mapping.name}_omniauth_authorize_path(provider, params = {})
+          def #{method}(provider, params = {})
             if Devise.omniauth_configs[provider.to_sym]
               script_name = request.env["SCRIPT_NAME"]
 
@@ -16,9 +17,12 @@ module Devise
               raise ArgumentError, "Could not find omniauth provider \#{provider.inspect}"
             end
           end
+          protected :#{method}
         URL_HELPERS
       end
 
+      protected
+
       def omniauth_authorize_path(resource_or_scope, *args)
         scope = Devise::Mapping.find_scope!(resource_or_scope)
         send("#{scope}_omniauth_authorize_path", *args)

test/controllers/internal_helpers_test.rb

@@ -35,7 +35,7 @@ class HelpersTest < ActionController::TestCase
   end
 
   test 'resources methods are not controller actions' do
-    assert @controller.class.action_methods.empty?
+    assert @controller.class.action_methods.empty?, "Expected empty, got #{@controller.class.action_methods.inspect}"
   end
 
   test 'require no authentication tests current mapping' do

test/omniauth/url_helpers_test.rb

@@ -28,31 +28,31 @@ class OmniAuthRoutesTest < ActionController::TestCase
   end
 
   test 'should generate authorization path' do
-    assert_match "/users/auth/facebook", @controller.omniauth_authorize_path(:user, :facebook)
+    assert_match "/users/auth/facebook", @controller.send(:omniauth_authorize_path, :user, :facebook)
 
     assert_raise ArgumentError do
-      @controller.omniauth_authorize_path(:user, :github)
+      @controller.send :omniauth_authorize_path, :user, :github
     end
   end
 
   test 'should generate authorization path for named open_id omniauth' do
-    assert_match "/users/auth/google", @controller.omniauth_authorize_path(:user, :google)
+    assert_match "/users/auth/google", @controller.send(:omniauth_authorize_path, :user, :google)
   end
 
   test 'should generate authorization path with params' do
     assert_match "/users/auth/open_id?openid_url=http%3A%2F%2Fyahoo.com",
-                  @controller.omniauth_authorize_path(:user, :open_id, :openid_url => "http://yahoo.com")
+                  @controller.send(:omniauth_authorize_path, :user, :open_id, :openid_url => "http://yahoo.com")
   end
 
   test 'should not add a "?" if no param was sent' do
     assert_equal "/users/auth/open_id",
-                  @controller.omniauth_authorize_path(:user, :open_id)
+                  @controller.send(:omniauth_authorize_path, :user, :open_id)
   end
 
   test 'should set script name in the path if present' do
     @request.env['SCRIPT_NAME'] = '/q'
 
     assert_equal "/q/users/auth/facebook",
-                 @controller.omniauth_authorize_path(:user, :facebook)
+                 @controller.send(:omniauth_authorize_path, :user, :facebook)
   end
 end