title: Rails ActiveSuppport:Concern and Private Methods
body: <p>This is a great idea about concern in rails: <a href="http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns">http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns</a></p>
  
  <p>And it's also a good idea to make very small methods that are not part of a public API. Without using concerns, those become private methods in a ruby class.</p>
  
  <p>Does it makes sense to create private methods inside of a Rails ActiveSupport::Concern module? If so, does private work both for regular instance methods and class methods in the concern definition?</p>