How do you tell the Rails version inside of a Rails app?

Question

Up to Rails 2.3.8, there is a constant:

RAILS_GEM_VERSION   "2.3.8"

but Rails 3.0.0 doesn't have it. Is there other ways?

Answer 1

使用Rails.version.

您可能需要从该类访问Rails中可能需要的大多数环境信息.

文档.