Merge pull request rails#4908 from kennyj/fix_3864

Fix url_for method's behavior. GH rails#3684.

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -489,7 +489,7 @@ def normalize_controller_action_id!
         # if the current controller is "foo/bar/baz" and :controller => "baz/bat"
         # is specified, the controller becomes "foo/baz/bat"
         def use_relative_controller!
-          if !named_route && different_controller?
+          if !named_route && different_controller? && !controller.start_with?("/")
             old_parts = current_controller.split('/')
             size = controller.count("/") + 1
             parts = old_parts[0...-size] << controller

actionpack/test/dispatch/routing_test.rb

@@ -2562,3 +2562,36 @@ def app; Routes end
     assert_equal "200", @response.code
   end
 end
+
+class TestMultipleNestedController < ActionDispatch::IntegrationTest
+  module ::Foo
+    module Bar
+      class BazController < ActionController::Base
+        def index
+          render :inline => "<%= url_for :controller => '/pooh', :action => 'index' %>"
+        end
+      end
+    end
+  end
+
+  Routes = ActionDispatch::Routing::RouteSet.new.tap do |app|
+    app.draw do
+      namespace :foo do
+        namespace :bar do
+          match "baz" => "baz#index"
+        end
+      end
+      match "pooh" => "pooh#index"
+    end
+  end
+
+  include Routes.url_helpers
+  def app; Routes end
+
+  test "controller option which starts with '/' from multiple nested controller" do
+    get "/foo/bar/baz"
+    assert_equal "/pooh", @response.body
+  end
+
+end
+