Produce and consume CSV with Rails

jeg2_consume_csv.rb

# from http://speakerdeck.com/u/jeg2/p/10-things-you-didnt-know-rails-could-do slide 64
require "csv"
namespace :users do
  desc "Import users from a CSV file"
  task :import => :environment do
    path = ENV.fetch("CSV_FILE") {
      File.join(File.dirname(__FILE__), *%w[.. .. db data users.csv])
    }

    CSV.foreach(path, headers: true, header_converters: :symbol) do |row|
      User.create(row.to_hash)
    end
  end
end

jeg2_produce_csv.rb

# from http://speakerdeck.com/u/jeg2/p/10-things-you-didnt-know-rails-could-do slide 199
class ArticlesController < ApplicationController
  def index
    respond_to do |format|
      format.html do
        @articles = Article.all
      end

      format.csv do
        headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
        self.response_body = Enumerator.new do |response|
          csv = CSV.new(response, row_sep: "\n")
          csv << %w[Subject Created Status]
          Article.find_each do |article|
            csv << [ article.subject,
                     article.created_at.to_s(:long),
                     article.status ]
          end
        end
      end
    end
  end
  # ...
end