config-rollout.rb

# config/initializers/rollout.rb

ROLLOUT_OPTIONS = YAML.load_file(Rails.root.join(“config”, “rollout.yml”))[Rails.env]

example.rb

...
# existing code

if Rollout.active?('my_new_feature_1')
  # implement new feature code here
end

lib-rollout.rb

# lib/rollout.rb

class Rollout                    
  def self.active?(key)          
    ROLLOUT_OPTIONS[key] || false
  end                            
end

rollout.yml

# config/rollout.yml

development:
  my_new_feature_1: true
  my_new_feature_2: true

test:
  my_new_feature_1: true
  my_new_feature_2: true

production:
  my_new_feature_1: false
  my_new_feature_2: true