Creating a list of publishing doi's from json export files

publishing_datacite_dois.rb

require 'csv'
require 'json'

CSV.open('publishing_datacite_dois.csv', 'wb') do |csv|
  csv << ['doi', 'title', 'url']
  ["10.18733.json", "10.20360.json", "10.21225.json", "10.21971.json", "10.18740.json", "10.20361.json", "10.21432.json", "10.21991.json", "10.25336.json"].each do |filename|
    file = File.open filename
    data = JSON.load file
    data["data"].each do |doi|
      csv << [doi["attributes"]["doi"], doi["attributes"]["titles"][0]["title"], doi["attributes"]["url"]]
    end
    file.close
  end
end