elcuervo/minuteman — pull request #3 by simi (2012-11-08 11:31:44+00:00)
Title: Use pluck(:id) instead of map(&:id)

If you're using AR3 code in Readme, you should use pluck instead of map. For more info - http://api.rubyonrails.org/classes/ActiveRecord/Calculations.html#method-i-pluck.