2 files changed, 29 insertions, 1 deletions
diff --git a/actionpack/lib/abstract_controller/compatibility.rb b/actionpack/lib/abstract_controller/compatibility.rb
new file mode 100644
index 0000000000..7fb93a0eb5
--- /dev/null
+++ b/actionpack/lib/abstract_controller/compatibility.rb
@@ -0,0 +1,18 @@
+module AbstractController
+  module Compatibility
+    extend ActiveSupport::Concern
+
+    def _find_layout(name, details)
+      details[:prefix] = nil if name =~ /\blayouts/
+      super
+    end
+
+    # Move this into a "don't run in production" module
+    def _default_layout(details, require_layout = false)
+      super
+    rescue ActionView::MissingTemplate
+      _find_layout(_layout({}), {})
+      nil
+    end
+  end
+end
diff --git a/actionpack/lib/abstract_controller/helpers.rb b/actionpack/lib/abstract_controller/helpers.rb
index 1d898d1a4c..eb621c0865 100644
--- a/actionpack/lib/abstract_controller/helpers.rb
+++ b/actionpack/lib/abstract_controller/helpers.rb
@@ -25,7 +25,7 @@ module AbstractController
       def inherited(klass)
         helpers = _helpers
         klass._helpers = Module.new { include helpers }
-
+        klass.class_eval { default_helper_module! unless name.blank? }
         super
       end
 
@@ -146,6 +146,16 @@ module AbstractController
           end
         end
       end
+
+      def default_helper_module!
+        module_name = name.sub(/Controller$/, '')
+        module_path = module_name.underscore
+        helper module_path
+      rescue MissingSourceFile => e
+        raise e unless e.is_missing? "helpers/#{module_path}_helper"
+      rescue NameError => e
+        raise e unless e.missing_name? "#{module_name}Helper"
+      end
     end
   end
 end