Simple rake task to import data from CSV

import_users.rb

#
# Taken from "Ten Things You Didn't Know Rails Could Do by James Edward Gray"
# http://www.youtube.com/watch?v=GRfJ9lni4QA
#

require 'csv'

namespace :users do
  desc "Import users from a CSV file"
  task :import => :environment do
    path = END.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

path = ENV.fetch ...