How do I detect in rails if I am running a rake command?

Question

In Rails, you might want your environment to do different things on startup depending on if you are running a rake task or not. For instance, my use case was having several hundred MB of cache loaded into memory on app start. We obviously don't want this to happen on rake commands.

---update--- The following is reliable solution and works with heroku.

is_rake = (ENV['RACK_ENV'].blank? || ENV['RAILS_ENV'].blank? || !("#{ENV.inspect}" =~ /worker/i).blank?)

Answer 1

If you are using heroku AND you are using workers, here is a more reliable way to do this check.

is_rake = (ENV['RACK_ENV'].blank? || ENV['RAILS_ENV'].blank? || !("#{ENV.inspect}" =~ /worker/i).blank?)