3 files changed, 18 insertions, 1 deletions
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 8c7e3327f3..dc9555b9d1 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## unreleased ##
 
+*   Fixed `ActionController#action_missing` not being called.
+    Fixes #9799.
+
+    *Janko Luin*
+
 *   `ActiveSupport::NumberHelper#number_to_human` returns the number unaltered when
     the units hash does not contain the needed key, e.g. when the number provided is less
     than the largest key proivided.
diff --git a/actionpack/lib/action_controller/metal/hide_actions.rb b/actionpack/lib/action_controller/metal/hide_actions.rb
index 109484d88c..1ded166491 100644
--- a/actionpack/lib/action_controller/metal/hide_actions.rb
+++ b/actionpack/lib/action_controller/metal/hide_actions.rb
@@ -28,7 +28,7 @@ module ActionController
       end
 
       def visible_action?(action_name)
-        action_methods.include?(action_name)
+        not hidden_actions.include?(action_name)
       end
 
       # Overrides AbstractController::Base#action_methods to remove any methods
diff --git a/actionpack/test/controller/base_test.rb b/actionpack/test/controller/base_test.rb
index affa9a6add..a652d8ffad 100644
--- a/actionpack/test/controller/base_test.rb
+++ b/actionpack/test/controller/base_test.rb
@@ -86,6 +86,12 @@ end
 class RecordIdentifierController < ActionController::Base
 end
 
+class ActionMissingController < ActionController::Base
+  def action_missing(action)
+    render :text => "Response for #{action}"
+  end
+end
+
 class ControllerClassTests < ActiveSupport::TestCase
 
   def test_controller_path
@@ -196,6 +202,12 @@ class PerformActionTest < ActionController::TestCase
     assert_raise(AbstractController::ActionNotFound) { get :hidden_action }
     assert_raise(AbstractController::ActionNotFound) { get :another_hidden_action }
   end
+
+  def test_action_missing_should_work
+    use_controller ActionMissingController
+    get :arbitrary_action
+    assert_equal "Response for arbitrary_action", @response.body
+  end
 end
 
 class UrlOptionsTest < ActionController::TestCase