Is Rails running in the current Ruby process?

Question

The Ruby mixin module I'm writing would be useful for both vanilla Ruby and Rails. What's the best practice for determining at run-time whether Rails is loaded? Is it possible to get the version number as well?

In script/console for a Rails 2.3.4 project ENV.has_key?("RAILS_ENV") is true and it's false in my Ruby 1.8.7 interpreter. Is there a more reliable way to tell for all versions of Rails or is this pretty safe?

As for getting the Rails version in the current process, I'm at a loss.

Answer 1

See if one of the Rails modules is defined with

defined?(Rails)

Additionally, you can get the version with

Rails.version