[aculver]

"Single responsibility principle (SRP): ... ActiveRecord::Base already has a responsibility: persistence."

Wrong. I'm hearing this more and more, but let's be clear: Active Record as a design pattern, before Rails, has always been a joining of business logic and persistence. (http://martinfowler.com/eaaCatalog/activeRecord.html) It's always been in violation of the single responsibility principle. If you want to avoid that, don't use Active Record! Use a Data Mapper, which specifically separates Mappers and Finders from Domain model classes. (http://martinfowler.com/eaaCatalog/dataMapper.html)

I'm not saying you can't move logic out into reusable modules or whatever is being recommended here, but please don't make it out like people are in the wrong when they're using the library or framework the way it was designed to be used.

[jamesgolick]

The point I was making was that you can use the library in a different way successfully.