Missing method error doesn't specify which controller it is missing f…

…rom [#4436 state:resolved]

The error page shown when the method you are requesting on a controller
doesn't specify which controller the method is missing from

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/abstract_controller/base.rb

@@ -106,7 +106,7 @@ def process(action, *args)
       @_action_name = action_name = action.to_s
 
       unless action_name = method_for_action(action_name)
-        raise ActionNotFound, "The action '#{action}' could not be found"
+        raise ActionNotFound, "The action '#{action}' could not be found for #{self.class.name}" 
       end
 
       @_response_body = nil

actionpack/test/controller/base_test.rb

@@ -90,6 +90,7 @@ class RecordIdentifierController < ActionController::Base
 end
 
 class ControllerClassTests < ActiveSupport::TestCase
+
   def test_controller_path
     assert_equal 'empty', EmptyController.controller_path
     assert_equal EmptyController.controller_path, EmptyController.new.controller_path
@@ -166,7 +167,15 @@ def use_controller(controller_class)
 
     rescue_action_in_public!
   end
-
+
+  def test_process_should_be_precise
+    use_controller EmptyController
+    exception = assert_raise AbstractController::ActionNotFound do
+      get :non_existent
+    end
+    assert_equal exception.message, "The action 'non_existent' could not be found for EmptyController" 
+  end
+
   def test_get_on_priv_should_show_selector
     use_controller MethodMissingController
     get :shouldnt_be_called