def process_tags tags
      case tags
      when String
        tags.split(" ").map { |t| process_tag t }.join(" ")
      when Array
        tags.map { |t| process_tags t }.join(" ")
      end
    end
def process_tags tags
      case tags
      when String
        tags.split(" ").map { |t| process_tag t }.join(" ")
      when Array
        tags.map { |t| process_tags t }.join(" ")
      end
    end
Convert a tag string or an array of strings to a space separated string

 @param tags [String, Array<String>]
 @api private