Configurable
实例方法
require 'active_support/configurable'
class User
include ActiveSupport::Configurable
end
user = User.new
# 写 config 对象
user.config.allowed_access = true
user.config.level = 1
# 读 config 对象
user.config.allowed_access # => true
user.config.level # => 1类方法
Configuration
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