FormtasticAddons fixed.

Author: Zhomart

lib/active_admin/mongoid.rb

@@ -13,6 +13,8 @@
 require 'active_admin/mongoid/helpers/collection'
 require 'active_admin/mongoid/criteria'
 
+require 'active_admin/mongoid/filters/formtastic_addons'
+
 module ActiveAdmin
   module Mongoid
     class Railtie < ::Rails::Railtie

lib/active_admin/mongoid/filters/formtastic_addons.rb

@@ -0,0 +1,12 @@
+module ActiveAdmin
+  module Filters
+    module FormtasticAddons
+
+      # The resource class, unwrapped from Ransack
+      def klass
+        @object.klass
+      end
+
+    end
+  end
+end