use _path in views, and scope to engine

app/controllers/merged/merged_controller.rb

@@ -1,6 +1,5 @@
 module Merged
-  class MergedController < ApplicationController
-#    layout 'merged_layout'
-
+  class MergedController < ::ApplicationController
+    before_action :authenticate_member!
   end
 end

app/controllers/merged/pages_controller.rb

@@ -14,7 +14,7 @@ module Merged
       @page.add_redirect
       @page.name = params[:name]
       @page.save
-      redirect_to page_path(@page) , notice: "Page renamed"
+      redirect_to page_url(@page) , notice: "Page renamed"
     end
 
     def create