show error message when trying to show a not existed page

app/controllers/application_controller.rb

@@ -2,9 +2,13 @@ class ApplicationController < ActionController::Base
   protect_from_forgery
 
   include ParserFrontEnd, ParserBackEnd, ApplicationHelper
-  include OrbitApp::ErrorHandlers
+  include OrbitApp::ErrorHandlers::PageErrorHandler
+  include OrbitApp::ErrorHandlers::ObjectAuthErrorHandler 
+  include OrbitApp::ErrorHandlers::ModuleAppErrorHandler 
+
   rescue_from ObjectAuthError, :with => :render_object_auth_error
   rescue_from ModuleAppError, :with => :render_module_app_error
+  rescue_from PageError, :with => :render_page_error
 
   layout :layout_by_resource
   

app/controllers/pages_controller.rb

@@ -76,7 +76,7 @@ class PagesController < ApplicationController
     end
     @item = Item.where(module_app_id: module_app.id,app_frontend_url:params[:app_action]).all_of("tag" => {"$in" => [nil,'']},"category" => { "$in" => [nil,'']}).first unless @item
     @item = Item.where(module_app_id: module_app.id,app_frontend_url:params[:app_action]).first unless @item
-    #TODO 需要做 error handler 處理沒有新增該模組頁面導致錯誤的可能性
+    raise PageError,'Missing Frontend Page'
   end
   
   def save_from_no_lang_for_page

app/errors/page_error.rb

@@ -0,0 +1,3 @@
+class PageError < StandardError
+  
+end

lib/orbit_app/error_handlers/applications_error_handler.rb

@@ -0,0 +1,14 @@
+
+# require  "#{File.dirname(__FILE__)}/module_app_error_handler.rb"
+# require  "#{File.dirname(__FILE__)}/object_auth_error_handler.rb"
+# require  "#{File.dirname(__FILE__)}/module_app_error_handler.rb"
+# require  "#{File.dirname(__FILE__)}/page_error_handler.rb"
+
+
+# module OrbitApp
+#   module ErrorHandlers
+#     module ApplicationsErrorHandler
+      
+#     end
+#   end
+# end

lib/orbit_app/error_handlers/page_error_handler.rb

@@ -0,0 +1,16 @@
+module OrbitApp
+  module ErrorHandlers
+    module PageErrorHandler
+      
+
+      def render_page_error(exception = nil)
+        default_message = 'ModuleAppErrorHandler'
+        meaasge = ''
+        if exception
+          meaasge = default_message + exception.message
+        end
+        render :text=>meaasge
+      end
+    end
+  end
+end