Where store or implement global variables ($) in Rails?

Question

I want to use/implement global variables in Rails. I tried the following:

In config/environments/production.rb:

$n_exams_question = 20

In config/environments/development.rb:

$n_exams_question = 3

I want to use different values in production and development. My localserver is not detecting the global variables. Where is the best place to implement it?

Answer 1

Rails does it that way: https://guides.rubyonrails.org/configuring.html#custom-configuration

In config/environments/production.rb:

config.myGlobalVariable = 'blabla1'

In config/environments/development.rb:

config.myGlobalVariable = 'blabla2'

then use this Anywhere:

Rails.configuration.myGlobalVariable