class method self.unrename_keys

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 155
      def unrename_keys(params)
        case params.class.to_s
          when "Hash"
            params.inject({}) do |h,(k,v)|
              h[k.to_s.tr("-", "_")] = unrename_keys(v)
              h
            end
          when "Array"
            params.map { |v| unrename_keys(v) }
          else
            params
        end
      end