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

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

      end
    end
  end
end
```

Add strong params for categories
user
```ruby
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
```
assistant