Add ActiveSupport load hook for DeviseController

app/controllers/devise_controller.rb

@@ -180,4 +180,6 @@ MESSAGE
   def resource_params
     params.fetch(resource_name, {})
   end
+
+  ActiveSupport.run_load_hooks(:devise_controller, self)
 end

test/controllers/load_hooks_controller_test.rb

@@ -0,0 +1,15 @@
+require 'test_helper'
+
+class LoadHooksControllerTest < ActionController::TestCase
+  setup do
+    ActiveSupport.on_load(:devise_controller) do
+      define_method  :defined_by_load_hook do
+        puts 'I am defined dynamically by activesupport load hook'
+      end
+    end
+  end
+
+  test 'load hook called when controller is loaded' do
+    assert DeviseController.instance_methods.include? :defined_by_load_hook
+  end
+end