Resilient CSV Export as a Streamed Response

                  require 'csv'

class Admin::ExportsController < ApplicationController
  include ActionController::Live

  def snips
    response.headers['Content-Type'] = 'text/csv'
    response.headers['Content-Disposition'] = 'attachment; filename="snips.csv"'

    response.stream.write(CSV.generate_line(%w[id title author views]))

    Snip.includes(:author).find_each(batch_size: 1000) do |snip|
      response.stream.write(CSV.generate_line([snip.id, snip.title, snip.author.nickname, snip.views]))
    end
  rescue IOError
    # client disconnected
  ensure
    response.stream.close
  end
end