normalize_keys

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 161
      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