lib/redis-model-extension/value_transform.rb
def value_to_redis name, value
      if redis_fields_config.has_key?(name)
        value_transform value, redis_fields_config[name]
      else
        value
      end
    end
def value_to_redis name, value
      if redis_fields_config.has_key?(name)
        value_transform value, redis_fields_config[name]
      else
        value
      end
    end
choose right type of value and then transform it for redis