rails hash formatter - hash/json to/from camel case and underscores

hash_converter.rb

module HashConverter
  class << self
    def to_underscore hash
      convert hash, :underscore
    end
    def to_camel_case hash
      convert hash, :camelize, :lower
    end
    def convert obj, *method
      case obj
      when Hash
        obj.inject({}) do |h,(k,v)|
          v = convert v, *method
          h[k.send(*method)] = v
          h
        end
      when Array
        obj.map {|m| convert m, *method }
      else
        obj
      end
    end
  end
end
puts HashConverter.to_underscore({ "helloILikeThis" => { "recursesThrough" => [{"evenInto" => "arraysButNotVals"}] }})
puts HashConverter.to_camel_case({"hello_i_like_this"=>{"recurses_through"=>[{"even_into"=>"arrays_but_not_vals"}]}})
puts HashConverter.to_camel_case HashConverter.to_underscore({ "helloILikeThis" => { "recursesThrough" => [{"evenInto" => "arraysButNotVals"}] }})