在我的主要扩展中,我有这种实例化计算器的标准方法。该模块是 Spree 预初始化过程的一部分:
module AgedRevolt
class Engine < Rails::Engine
config.autoload_paths += %W(#{config.root}/lib)
def self.activate
Dir.glob(File.join(File.dirname(__FILE__), "../app/**/*_decorator*.rb")) do |c|
Rails.env.production? ? require(c) : load(c)
end
Calculator::PerWeight.register
end
config.to_prepare &method(:activate).to_proc
end
end
然后当我运行服务器时,我得到了这个:
app/models/calculator/per_weight.rb:16:in `register': uninitialized constant Calculator::PerWeight::Coupon (NameError)
所以我尝试独立运行它们并得到这个:
ruby-1.8.7-p330 :002 > Coupon
NameError: uninitialized constant Coupon
from (irb):2
ruby-1.8.7-p330 :003 > ShippingRate
NameError: uninitialized constant ShippingRate
from (irb):3
那可能来自什么?