Change parent controller to ActionController::Base for out-of-box sup…

…port of Rails 5 API mode

To keep old behavior, add `config.parent_controller = '::ApplicationController'` in your RailsAdmin initializer.

Fixes #2688

CHANGELOG.md

@@ -4,6 +4,9 @@
 
 [Full Changelog](https://github.com/sferik/rails_admin/compare/v1.0.0.rc...HEAD)
 
+### Changed
+- Change parent controller to ActionController::Base for out-of-box support of Rails 5 API mode([#2688](https://github.com/sferik/rails_admin/issues/2688))
+  - To keep old behavior, add `config.parent_controller = '::ApplicationController'` in your RailsAdmin initializer.
 
 ## [1.0.0.rc](https://github.com/sferik/rails_admin/tree/v1.0.0.rc) - 2016-07-18
 

lib/rails_admin/config.rb

@@ -283,7 +283,7 @@ def reset
         @show_gravatar = true
         @navigation_static_links = {}
         @navigation_static_label = nil
-        @parent_controller = '::ApplicationController'
+        @parent_controller = '::ActionController::Base'
         RailsAdmin::Config::Actions.reset
       end
 

lib/rails_admin/engine.rb

@@ -23,7 +23,8 @@ class Engine < Rails::Engine
       )
     end
 
-    initializer 'RailsAdmin pjax hook' do |app|
+    initializer 'RailsAdmin setup middlewares' do |app|
+      app.config.middleware.use ActionDispatch::Flash
       app.config.middleware.use Rack::Pjax
     end