问在Ruby/ RoR中同时定义常量的最佳方法

EN

# config/initializers/constants.rb, for example.
module Constants
  PI = 3.1415926535897932384626433832795028841971
end

# app/models/circle.rb
class Circle
  attr_reader :radius

  def area
    Constants::PI * radius ** 2
  end
end

module MyApp
  APP_CONST_1 = 42
  APP_CONST_2 = 3.14
  # ...
end

class MyApp::User
  def the_answer
    MyApp::APP_CONST_1 # 42
  end
end