deprecated_method_warning

# File activesupport/lib/active_support/deprecation.rb, line 103
      def deprecated_method_warning(method_name, message=nil)
        warning = "#{method_name} is deprecated and will be removed from Rails #{deprecation_horizon}"
        case message
          when Symbol then "#{warning} (use #{message} instead)"
          when String then "#{warning} (#{message})"
          else warning
        end
      end