ActiveRecord: Write a CSV of a model

model_csv.rb

require 'csv'

def write_model_csv(model_class, filename=nil)
  filename = model_class.to_s.underscore.pluralize + '.csv' if filename.nil?
  CSV.open(filename, 'wb') do |csv|
    names = model_class.columns.map(&:name)
    csv << names
    model_class.find_each do |model|
      csv << names.map {|attr| model[attr] }
    end
  end
  puts "CSV for #{model_class.to_s} written to #{filename}."
end


write_model_csv(User)