application_model.rb

ActiveRecord::Base#ids

  #######
  #     #
  # ids #
  #     #
  #######
  
  public
  
  def self.ids(query_options = {})
    values(query_options).map &:to_i
  end
  
  def self.values(query_options = {})
    sql = self.send(:construct_finder_sql, { :select => "#{table_name}.id" }.merge( query_options ))
    self.connection.select_values(sql)
  end