how to get domain url in initializer file, rails

Question

i was wondering if it was possible to get the domain url ie

localhost or myapp.heroku.com

from an initializer file?

i believe the

request.url

and the request methods only work in controllers. is there an equivalent to the javascript

document.domain

that i could do in an initializer file? or could i embed the .rb file with javascript? or other alternatives to the request object?

ive tried a number of things that don't work such as

Rails.root 

and am having trouble trying to figure it out.

thank you = )

Answer 1

i just changed one of my apps to a staging environment. i couldn't get the socket to work.

heroku config:add RAILS_ENV=staging --app myapp-staging
heroku config:add RACK_ENV=staging --app myapp-staging

and then i made a staging.rb file inside my environments folder (i just copied and pasted everything from my production file) and rails was able to infer the method

Rails.env.staging?

in my initializer

Answer 2

Something like:

require 'socket'

Socket.gethostname