You will most probably need to have at least one particular
case where you need to store configuration values for your
Rails application. Saving these types of values in the
environment is one of the principles of a
twelve-factor app. It is
thus recommended to use a separate file and use environment
variables inside your code so that you do not have to change
the same value in multiple places. This, however, is not
something that you can do really easily unless you use
something really helpful like dotenv.