Rails - How do I check developer mode or production mode in code

I am doing a project in rails, I would like to know开发者_Go百科 How do I check whether I am running in developer mode or production mode in code ?

Thanks

---

Rails.env == "production"

Rails.env == "development"

As mentioned by @xoebus, this is far better:

Rails.env.production?

Rails.env.development?