How to tell if rails is in production?

Question

I used script/server -e production to start rails in production mode. It did and I got no errors. However how do I tell if it is in production mode? I tried a non-existent route, and I got a similar error page I did in development.

I thought if under production model, I get the 404 error page that is in my /public folder.

Does it mean it didn't start in production mode?

Thanks for your help.

Answer 1

If its Rails 3.1+, Rails.env.production? will return true when in production.

Rails.env.production?  #=> true   Rails.env.staging?     #=> false Rails.env.development? #=> false   

Answer 2

For modern Rails versions (3+), Rails.env returns the environment as a String:

Rails.env #=> "production" 

There are also helpful accessors* for each environment that will return a Boolean:

Rails.env.production?  #=> true   Rails.env.staging?     #=> false Rails.env.development? #=> false 

(*) There's a gotcha here: these aren't real accessors. They're just strings of letters and if they happen to match the current environment name, they return true. They fail silently. That means that you can be in production, but if have a typo in this code, you won't get an error, you'll simply get false:

Rails.env.producton?  #=> false 

For that reason, I set constants in an initializer and only refer to those in the rest of my code. This lets the Ruby interpreter help me catch my own errors:

PRODUCTION = Rails.env.production? DEVELOPMENT = Rails.env.development? TEST = Rails.env.test?