unrename_keys

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 146
      def unrename_keys(params)
        case params.class.to_s
          when "Hash"
            Hash[params.map { |k,v| [k.to_s.tr("-", "_"), unrename_keys(v)] } ]
          when "Array"
            params.map { |v| unrename_keys(v) }
          else
            params
        end
      end