module Refinery
  module Products
    module Admin
      class CategoriesController < ::Refinery::AdminController

        crudify :'refinery/products/category',
                :xhr_paging => true

        private
          def category_params
            params.require(:category).permit(:title)
          end
      end
    end
  end
end

module Refinery
  module Products
    module Admin
      class CategoriesController < ::Refinery::AdminController

        crudify :'refinery/products/category',
                :xhr_paging => true

      end
    end
  end
end

--- 
+++ 
@@ -6,6 +6,10 @@
         crudify :'refinery/products/category',
                 :xhr_paging => true
 
+        private
+          def category_params
+            params.require(:category).permit(:title)
+          end
       end
     end
   end
Add strong params for categories
