"Just upgrade to Rails 4." Five words, months and months of hair loss. There is a lot less radical change and a lot more focus on compatibility in Rails nowada

"Just upgrade to Rails 4." Five words, months and months of hair loss. There is a lot less radical change and a lot more focus on compatibility in Rails nowadays, and yet upgrading a substantial app to a new version of Rails is still a shaky proposition. For a lot of companies, the gigantic leap from 2.3 to 3 was more trouble than just paying somebody to maintain 2.3.