ActiveScaffold: Export records to CSV

CSVファイルにデータをexportするための修正点。

ActiveScaffold を使って Ruby on Rails を機能アップする

より引用。
controllerの変更点。

class UsersController < ApplicationController
  active_scaffold :user do |conf|
    conf.action_links.add 'export_csv', :label => 'Export to Excel', :page => true
  end
 
  def export_csv
    # find_page is how the List module gets its data. see Actions::List#do_list.
    records = find_page().items
    return if records.size == 0
 
    # Note this code is very generic.  We could move this method and the
    # action_link configuration into the ApplicationController and reuse it
    # for all our models.
    data = ""
    cls = records[0].class
    data << cls.csv_header << "\r\n"
    records.each do |inst|
      data << inst.to_csv << "\r\n"
    end
    send_data data, :type => 'text/csv', :filename => cls.name.pluralize + '.csv'
  end
end
モデルの変更点。
class User < ActiveRecord::Base
  # The header line lists the attribute names.  ID is quoted to work
  # around an issue with Excel and CSV files that start with "ID".
  def self.csv_header
　　  "ID,Last Name,First Name, Email, Birthdate"
  end
  # Emit our attribute values as a line of CSVs
  def to_csv
    id.to_s << "," << last_name << "," << first_name << "," << email
       << "," << birthdate.to_s
  end
end