解决方法
如果包含模块,该方法将成为一个实例方法,但如果扩展该模块,那么它将成为一个类方法.
module Const
def format
puts 'Done!'
end
end
class Car
include Const
end
Car.new.format # Done!
Car.format # NoMethodError: undefined method format for Car:Class
class Bus
extend Const
end
Bus.format # Done!
Bus.new.format # NoMethodError: undefined method format