CanCan with column

cancan_with_col.rb

        # is usually called with :crud_type and :column, or :action
        #     {:crud_type=>:update, :column=>"some_colum_name"}
        #     {:action=>"edit"}
        # to allow access cancan must allow both :crud_type and :action
        # if cancan says "no", it delegates to default AS behavior
        def authorized_for_with_cancan?(options = {})
          raise InvalidArgument if options[:crud_type].blank? and options[:action].blank?
          if current_ability.present?
            crud_type_result = options[:crud_type].nil? ? true : current_ability.can?(options[:crud_type], self)
            action_result = options[:action].nil? ? true : current_ability.can?(options[:action].to_sym, self)
            column_result = if (options[:crud_type].present && options[:column].present)
              current_ability.can?("#{options[:crud_type]}_#{options[:column]}".to_sym, self)
            else
              true
            end
          else
            crud_type_result, action_result, column_result = false, false, false
          end
          default_result = authorized_for_without_cancan?(options)
          result = (crud_type_result && action_result && column_result) || default_result
          return result
        end