module PluckMap
  module CsvPresenter

    def to_csv(query)
      define_to_csv!
      to_csv(query)
    end

    private def define_to_csv!
      require "csv"

      headers = CSV.generate_line(attributes.map(&:name))
      ruby = <<-RUBY
      def to_csv(query)
        pluck(query) do |results|
          rows = [#{headers.inspect}]
          results.each_with_object(rows) do |values, rows|
            values = Array(values)
            rows << CSV.generate_line([#{attributes.map(&:to_ruby).join(", ")}])
          end.join
        end
      end
      RUBY
      # puts "\e[34m#{ruby}\e[0m" # <-- helps debugging PluckMapPresenter
      class_eval ruby, __FILE__, __LINE__ - 7
    end

  end
end