Please read the post and watch the podcast.

The basic idea is:

1. Define a “yml” file which contains the configuration information under the “config/“ directory;

2. Add a “initializer” ruby file(such as “load_config.rb”) in the “config/initializers/“ directory which has the code to load the yml file;

3. In your Rails code use the loaded configuration information.

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development:
  perform_authentication: false

test:
  perform_authentication: false

production:
  perform_authentication: true
  username: admin
  password: secret

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APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml")[RAILS_ENV]

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def authenticate
  if APP_CONFIG['perform_authentication']
    authenticate_or_request_with_http_basic do |username, password|
      username == APP_CONFIG['username'] && password == APP_CONFIG['password']
    end
  end
end