Getting app comple URL based on the environment

Rails
#1

I’m building an email with a URL on it that change depending on the
environment I’m at. For example http://localhost:3000/demo on
development and http://www.xyz.com/demo on production.

Is there any environment variable or method that could tell me the
complete URL of my web application? I’m looking for an alternative to
environment config files.

#2

request.domain in your controller should do it

ed