#23: return json response at RoutingError

app/controllers/application_controller.rb

@@ -18,10 +18,9 @@ class ApplicationController < ActionController::Base
   helper_method :get_owner
 
   unless Rails.env.development?
-
     rescue_from Exception, :with => :render_500
     rescue_from ActiveRecord::RecordNotFound,
-                ActionController::RoutingError,
+                # ActionController::RoutingError, # see: config/routes.rb:<last line>
                 ActionController::UnknownController,
                 AbstractController::ActionNotFound, :with => :render_404
   end
@@ -32,12 +31,13 @@ class ApplicationController < ActionController::Base
 
   rescue_from Grit::NoSuchPathError, :with => :not_found
 
-  protected
 
   def render_404
     render_error 404
   end
 
+  protected
+
   def render_500(e)
     #check for exceptions Airbrake ignores by default and exclude them from manual Airbrake notification
     if Rails.env.production? && !AIRBRAKE_IGNORE.include?(e.class)

config/routes.rb

@@ -343,4 +343,9 @@ Rosa::Application.routes.draw do
       get '/' => 'groups/profile#show', :as => :group
     end
   end
+
+  # As of Rails 3.0.1, using rescue_from in your ApplicationController to
+  # recover from a routing error is broken!
+  # see: https://rails.lighthouseapp.com/projects/8994/tickets/4444-can-no-longer-rescue_from-actioncontrollerroutingerror
+  match '*a', :to => 'application#render_404'
 end