normalize_keys

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 141
      def normalize_keys(params)
        case params
          when Hash
            Hash[params.map { |k,v| [k.to_s.tr('-', '_'), normalize_keys(v)] } ]
          when Array
            params.map { |v| normalize_keys(v) }
          else
            params
        end
      end