category.rb

class Category < ActiveRecord::Base
  configure do
    option :sort do
      default  'alphabetical'
      restrict 'alphabetical', 'manual'
    end

    option :limit do
      format 'fixnum'
    end

    option :price_filter do
      format    'float'
      modifiers 'eq', 'lt', 'gt', 'lte', 'gte'
      multiple  true
    end
  end
end