What's the "right" way to DRY up this statement in my app?
if ::Rails.env == 'staging'
domain = '.staging-domain.com'
else
domain = '.production-domain.com'
end
I am using it in a mailer, as well as, the session_store.rb initializer.
Not sure how I should make this "domain" variable available across my
entire app the "Rails" way.
I would put it in your config/environments/[environment].rb files, one per environment, or put the local (test/development) one in your environment.rb file, and the deployment version in the production.rb file.
in each environment. This has the added bonus of ensuring that full URLs always get generated with the right host. You may need to also set config.action_mailer.default_url_options[:host] to get the same information to your mailers.