gistfile1.rb

def self.each(key_column = :id, &block)
  connection.select_values("SELECT `#{key_column}` FROM `#{table_name}`").each do |key|
    begin
      yield(find(key))
    rescue ActiveRecord::RecordNotFound
      # Ignore records which may have been deleted between the time the
      # list is created and the record is fetched.
    end
  end
end