csv_serializer.rb

# frozen_string_literal: true

class CsvSerializer
  attr_accessor :data

  def initialize(serializer)
    @serializer = serializer
    @data = serializer&.serializable_hash&.dig(:data) || []
  end

  def as_csv
    CSV.generate(headers: true, col_sep: "\t") do |csv|
      csv << headers.map { |h| h.to_s.titleize }
      data.each { |hash| csv << row(hash[:attributes]) }
    end
  end

  private

  def headers
    return ['No data'] if data.blank?

    @headers ||= @serializer.class.attributes_to_serialize.to_h.keys
  end

  def row(attributes)
    attributes.each_with_object([]) { |(k, v), o| o[headers.index(k)] = v }
  end
end