我正在使用Mash.to_module(来自Hashie)将类设置。这工作正常,单元测试我的配置系统,我想能够重置此类方法。经过5个小时的挣扎之后,我终于找到了一种方法来删除类方法设置,但是我不能把它放回去......在undef之后还有其他生活方式,或者删除类方法的另一种方法? this question的解决方案似乎不起作用。我正在使用ruby 2.1.5。如何删除类方法?
下面是一些测试代码:
class Mash < Hash
def to_module(mash_method_name = :settings)
mash = self
Module.new do |m|
m.send :define_method, mash_method_name.to_sym do
mash
end
end
end
end
class B
class << self
def reset
# singleton_methods.include? :settings # true
# methods.include? :settings # true
# remove_method :settings # method `settings' not defined in #<Class:B>
# send :remove_method, :settings # method `settings' not defined in #<Class:B>
# singleton_class.remove_method, :settings # method `settings' not defined in #<Class:B>
# B.singleton_methods.include? :settings # true
# B.methods.include? :settings # true
# B.send :remove_method, :settings # method `settings' not defined in #<Class:B>
# B.singleton_class.send :remove_method, :settings # method `settings' not defined in #<Class:B>
# methods.include?(:settings) and undef :settings # unexpected keyword undef
undef :settings if methods.include?(:settings) # works
end
end
end
B.extend Mash.new.to_module
b = B.new
B.settings # {}
# b.settings # undefined method `settings' <- intented behaviour
# B.instance_eval { remove_method :settings } # `remove_method': method `settings' not defined in B
# B.instance_eval { undef :settings } # WORKS !
B.reset
# B.settings # # undefined method `settings' <- GOOD!
B.extend Mash.new.to_module
B.settings # undefined method `settings' => OOPS, is there life after undef?
谢谢!这有助于我进一步。但是,如果我理解得很好,做你的建议只会影响使用这个模块的一切,而不仅仅是我试图影响的课程。 – nus
噢,我明白了,我可以改变模块以使用'extended(base)'使方法直接在接收器的单例类上定义。 – nus
这会影响所有使用该模块的人,但是由于您已经介绍过该模块从未重用过的内容。 –